What are the side effects of Simparica?

Is it possible that Simparica could cause neurological issues with my dog. He was diagnosed with "Sundowners" . I have noticed that he hardly needs no meds for this neurological issue near the end of the month. I give my dogs Simparica at the beginning of each month. Just wondering?

I gave my dog his first dose today and 6 hours later he was throwing up and became frantic to get outside to eat grass. Although he didn’t continue throwing up and was fine otherwise, he was still outside 12 hours later eating grass. I’m switching back to the old stuff.

Gave my dog Charlie Simparica yesterday now he is shaking and panting really bad. No appetite, not like Charlie. He seems dehydrated. I've tried Gatorade and Ginger ale but he only drank a little. What should I do?

We gave Simparica two days ago and he's not had an appetite, he's eating grass, is drinking a lot of water and sleeping. How long do the side effects last? We wont be using this medicine ever again!

Gave Simparica to my dog yesterday. Today he won’t eat, is sleeping all day, and when he is up he is panting heavily. I’m done with this drug!

I gave my precious puppy this and 12 hours later
He is having profuse diarrhea, urinating constantly and he is supper agitated
My vet did not tell me anything about the side effects

I am sure simparica caused a fatal seizure in my boxer. She passed away soon after taking this medication. I will never use this product again!!!!! I advise all pet owners to know the side effects. My veterinarian did not warn me of these and now my precious boxer is gone!!!!!

I feel so sad for you Camelia. Thank you for giving information on what happened to your dog. Our new vet has recommended Simperica, but I won’t be giving it to my Collie.

Gave my 28lb German Spitz her monthly prescibed dose of Simparica. Not long after ingesting the chewable she began to have tremors, but not full blown seizures. Tremors continued, on and off, for 2 hours. Took her to her Vet where I was told she had another tremor. They could either keep her there for observation or I could take her home to observe her. I took her home. She's been given this dosage for over a year. First time for this adverse reaction. 5 hours after the dose she's home resting. I'll continue to watch her.

gave this to my dog three different times. This time he is having seizures. He will be laying then start shaking all over..Has tremors every 5 minutes for 2 hours now.

Gave this to my dogs and now he sleeps all the time and tired and has symptoms now like droopy right side weakness can’t blink right eye and drooling like bell’s palsy

I am up writing this 4 a.m. since our Lambchop is too restless to sleep! Never happened before. Gave Simparica yesterday and am suspect. Has odd agitated swallowing when not eating anything. He's a 1 1/2 y.o. Coton de Tulear.

My vet prescribed my 16 week old puppy this drug because of a skin irritation. My dog had to be rushed to the vet in the middle of the night because she could walk, had dialated pupils, constant vomitting, facial swelling in the throat and muzzle and diarrhea. She is still in the vet since 3am. My vet never mentioned that puppies under 6months cannot be prescribed this medication. Still waiting to find out of she has progressed. Very dissapointed with my vet for not informing me of the risk this has on my dog.

This drug has caused our dog to loose his footing and not eat. He looked like he was having spasms. Doing better now, 2 days later. No more Simparica for him.

Our dog has not been given another dose. I will be speaking to vet to switch to something else. The reaction lasted less than 12 hours. She's been fine since. Doubtful our dog will be given Simparica again.

we gave our dane Simperica Brown about a day or so ago and all the sudden my sweet girl is having seizures. Never had them ever and she's only 3 1/2 yrs old. Still waiting on the vet and waiting to talk to ASPCA poison control. Furious that this out there for pets. Vets at Petsmart should know better; changing vets

My Irish setter is weak on her left side, left side of her face is drooping and she now carries her head with a tilt to the left. It has been 20 days since I gave her the prescribed dose of Simparica. The issues started within 24 hours of the dose and continue. This was the first time she was given this drug and will be the last. I feel like this drug was pushed by my vet tech and veterinarian. My dog weighs 60 pounds and was given a dose for dogs up to 88 pounds. I feel like it was a massive overdose. She falls when she runs and when going up and down stairs. She’s not the carefree setter she was prior to this medication.

This is terrible. We gave our 3.5 month old Aussie pup a dose of Simparica today (vet's prescription), and I did not see the warnings about giving it to dogs under 6 months. She had what seemed like a seizure 6 hours after ingesting this product--she was lying in her crate, she peed while lying down, and she vomited, then began rocking back and forth--and now I am terrified for her (it's Saturday, nearly midnight, so tomorrow is Sunday and everything is closed). I've spoken to emergency vets and they say they are booked solid and that I need to just monitor her through the night. She's wobbly on her feet and seems lopsided, although her eyes look ok; she is really lethargic and barely lifting her head. I'm just so angry that the vet prescribed this and I am mad at myself for not researching it.

My Labradoodle had extreme diarrhea last night. My wife and I didn't understand why. After realizing that the only thing that we did differently was to give him his first dose of Simperica, my wife began research and came across this conversation. Thankfully there have been no other side effects. Thanks all for sharing your experiences. It really helped us to put this diarrhea condition in perspective.

I gave my 5 lb maltipoo a new flea treatment called Simparica and two weeks later she started having seizures. They have increased and worsened over the last 3 months. I’ve spent over $3,000 on vet bills for at least four visits to the ER and follow up lab work including X-rays. The vet has not been able to diagnose a cause. I even told them about the Simparica which they don’t respond to.
They put her on Phenobarbital to stop the seizures but cause her to be very wobbly and she’s been throwing up over the last two days and stopped eating today. How can I help of the manufacturer’s of Simparica responsible for causing so many dogs to experience these adverse and most likely permanent side effects.

Gave my dogs simparica and they both have lost their appetite! The king cavalier bichon mix seems to be ok just not eating much if at all. The Maltese mix is lethargic and won’t jump on bed or couch. I don’t know what to do to get this out of their system?? Please advise!

just gave my one year old dauchund her first dose of simparica My vet didnt tell me

We gave our Yorkie this and she went into seizures later in the day...what if any thing can be done

My beautiful boxer lost his appetite after just one dose of Simparica. The following day he would not even drink water.
After a vet visit, he was put on a good gastro food and probiotics and he seems to be back to his old self. In his case it was all a digestion side effect but a nasty one also with diarrhea.

I recently switched my 3.5 year old German Shepard to simparica and about 2 weeks after his first dose he had two seizures in one night and has NEVER had them before. We rushed him to the emergency vet and they put him on keppra to stop the seizures. But im 99% sure the simparica is what caused it. And im so mad that my vet didn't inform me of the side effects and im so mad I didn't research it myself.

The vet just gave our 16lb shorkie this on Tuesday and he still has the tremors really bad and very lethargic, I’m very worried and concerned. Anything I can do for him? Thank you

We gave our 13 yr old lab mix this medicine as our doctor doesn't carry trifexis anymore. Eight hours later and she has terrible diarrhea and vomiting, now she is not eating. She spent 4 nights at the University of Auburn emergency room and vet clinic. I went and picked her up today and all she does is lay around and drink water, turns her nose up at anything food related. I am so beyond mad, what can I do to get this out of her system and better yet what can we do to get this product off the market.

This Tuesday the 17th I had given my dog simparica trio for 27lbs dose. That evening after giving it to him he has puked various times. Will not eat or drink. I've had to syringe water in his mouth. He is acting very skittish/scared like behavior, wants to just lay down. Haven't noticed any other symptoms to him besides the puking, not eating and skittish. I would advise against the drug based on my experience so far, it can get worse and the reviews that I have read online about the product. I wish I read about this particular product before giving it to my dog because now I'm worried he may get more symptoms. Will be talking to the vet inregards to his side effects.

I have my 14 week old pup simparica (vet recommended) 2 days ago. Poor baby has had vomiting and diarrhoea ever since. She is lethargic and doesn’t want to eat. I am keeping a close eye on her and will take her to the vet if she hasn’t improved by tonight. This crap is poison! Never again are my dogs getting oral medication for fleas & ticks. This stuff should be banned.

Gave my 12 year old labradoodle simpatico just before going to my son’s for T-Day dinner. Got home 4 hours later and my dog fell down three times and is now seizing ... mainly her head . Hard fast shaking and terrified eyes. She has been the healthiest, happiest dog. Seizures are going on two hours....☹️

Follow up: my Labradoodle visited the ER on T-Day for 2 hrs. Seizures continue and it’s Monday. Dr said either Simparica (best case scenario), GOLPP or brain tumor. Good appetite but seizures cause her to fall...Dr says: leash walks, keep kenneled or confined in small room, no playing for 7-10 days and see what happens ???? If she recovers, cause is the Simparica. Not known if there be permanent after-effects.

Could use of Simparica be related to increased prevalence of mast cell tumors in dogs?

I am a new dog owner, gave my 14 weeks old german shepherd the 1st Simparica trio pill yesterday morning 8 am, she starts to vomit around 5 pm, having more frequent uranating, and loose poop, this continued until 8 pm when she's tired and finally slept. I will not give it to my puppy again, but what is a safer med. for flea and ticks? Any suggestion?

My 14 year old, 3.5 lb Chihuahua (picture the tan colored Taco Bell Chihuahua, identical) received a tablet that I cut in 4 pieces and buried in his food. Shortly after tablet I introduced sweet potatoes to diet per vet in lieu of potatoes. I would, still boil chicken, carrots, potatoes for his meals. He developed these big sores which scab over quickly, hair falling out here and there. He returned to vet, rec'd an allergy injection, first in his life, plus Penicillin x 10 days. I quit the canned sweet potatoes (he loved them) thinking it was the syrup, that I drained anyway before adding to mixture. Everything else in his environment, world has remained the same. When he lays in the sun you can see the bumps under his skin. When I bathe him the scabs fall off and I think, oh good, this problem is going away. Then they come back! I have paid about $500 - $600 to heal the little King, but it's not working. We have an appt for a skin scraping. Has anyone had a dermatitis issue as a result of Simparica? He already has canine dementia on and off. Is due for another tablet but I have been holding off. I'm at a loss...

Gave our Bloodhound Simparico Trip on Tuesday on Thursday he got extremely thirsty and was peeing everywhere from drinking so much water. He is eating fine with no diarrhea or vomiting. He just isn’t himself. He is a 6 month old Bloodhound so they are always hyper. We have given him pedialyte. Does this sound familiar to anyone? Thank you all so much!!!!

Gave my 14 month old 88 lb. Puppy Simparico Trio for the first time 2 days ago. Today, he wouldn't eat or drink any water. Took to vet and she said it could be the Simparico Trio. He has been on just Simparica with no problems. Simparico Trio, will not be given to my dog ever again.

This may post twice - I didn't see my original post so I'm trying again! I gave my 10 year old Bull Terrier a dose of Simparico Trio Thursday December 3. On Friday he was incredibly thirsty - he would drink a full bowl of water and then look at me for more. We have never had issues with him peeing in the house - EVER, and he peed in my office. We had family in for the weekend and he was not himself. Not wanting to play, shivering, and drinking excessively. Once again peed in my office on Saturday. Sunday I started watching how much water he was drinking feeling bad that I was restricting him, so I made sure to take him out to pee every few hours. Getting him to go out was nearly impossible. It seemed impossible that our boy could age years in literally 3 days. The ONLY thing that could cause such a huge change in behavior and personality had to be giving him the Simparico Trio the previous week. Monday, Tuesday, Wednesday and Thursday he slept all day, was hesitant to get up, wouldn't play with his ball, continued to drink excessively and shivered. Even when asked to go for a car ride he didn't respond. Today is Friday. He woke up and seemed much brighter. I threw him his ball and he actually was interested in it. This morning was the first morning he left water in his bowl. Hopefully, there is no permanent damage to his brain or body. I'm so glad I found this forum, it confirmed my instincts that this drug is very harmful.

My aunt gave her 5.5-kg, 13-year-old female shih tzu the first dose of Simparica and she has never been the same as she shows symptoms of cardiopulmonary illness: lethargy, loss of appetite, vomit, coughing, seizure and excessive drinking. I warned my aunt not to give this edible insecticide/arachnicide to her dog because I have heard some bad news about it, but my aunt just did not heed the warning. Now her dog is very sick and she has to take the dog to the vet every day in the past week. And it looks like the liver and/or the kidney will not take it too. If you need to get rid of parasites, spot-on (the one by a German company is effective enough) will do the job and do it safely. Don't risk the well-being of your beloved dog just because something is more convenient.

I was giving my 70 lb golden doodle Trifexus, for nearly 2 years until suddenly he refused to eat it. The company that makes it said they didn’t change the flavor, but I live in a high tick area, so switched to Simparica Trio. I gave the 1st one to my dog, 1st of this month. No side effects. I suppose with any drug, during trials, there will be some who have side effects ranging from negligible to life threatening. If most side effects are mild, ( vomiting 12 hours later could be due to other things the dog has eaten within those 12 hours), I am ok with that.
BUT...
I want to know, what was the size of the test group, and how many dogs had each side effect? Is there a way to find this out? And, is a 3 month trial really long enough for a drug that is basically an insecticide?

All these comments sadden me!
My pup has had zero adverse side effects to Simparica Trio and I hope that continues.
For those asking about the trials -- I found the information here https://www2.zoetisus.com/content/_assets/docs/Petcare/simparica-trio-pi.pdf?_ga=2.223688731.1016898103.1608045514-861822939.1608045514&_gac=1.160980559.1608045516.Cj0KCQiA2uH-BRCCARIsAEeef3m64ho1RNpYyKyE2TXamcOK-YEQbZcN9yaWL1OjRk_nlhnVZfLfDv8aApb9EALw_wcB

my vet recommended this for both my yorkies. 1 is pregnant I told the vet what can I give the pregnant yorkie she said sampirica sold me a 3 month supple for her. I gave it to her then I looked at the box that said never tested on pregnant dogs . lola weighs about 9lbs. she has shaking off and on . not eating alor and wants me to rub her tummy constantly . like she wants me to fix it. I am very worried I called the vet they said oops sorry they made a mistake. so what about her puppies I am so worried.

My 11 year old mini Aussie has been taking Simparica 1.5 years. Last month she had diarrhea and it lasted 7 days. Like many of you, I was unsure about the cause. But this month we are at day 7 and I expect the diarrhea it to continue. This time I am seeing a little blood or tissue in her stool. Over the past month she has stumbled a few times when on walks. Never happened before. Reading your comments, this drug may be the cause. I’m throwing away the remaining 5 pills and going back to a topical medicine. I hope this drug has not caused permanent damage.

We just gave the first does to our 11 week old Sheepadoodle puppy yesterday. Lost his appetite & was low on energy all day yesterday, slept most of the day - which is very unusual for him. Today started diarrhea & he has gone 5 times so far while not eating much. Plan to take him to see the vet tomorrow. Wonder why PetSmart offers this if there are so many concerns reported.

Few questions
- have you guys asked for these issues to be reported by the vet to company & FDA?
- how long does the symptoms last? A little concerned & worried about the little puppy

Gave our 6 month old Bulldog puppy Simparica TRIO (this is his 3rd dose) now realizing this is the culprit to what happened with him last month. He’s very lethargic and constant vomiting! I will never give this again!

Today was my 14 year old Jack Russell's 2nd dose of Simparica, her name is Rallye. After her first dose she had diarrhea, vomiting and developed a terrible wheezing hacking cough. The diarrhea and vomiting went away after a few days but the cough has lingered for over a month now even with treatment. It is better but not gone. Then she started having tremors. This is still going on weeks later.
Additionally she is having urination problems. She goes like 50 times a day and it is long and slow. I told the vet about her first dose and they said "oh that's a good medication" and attributed her symptoms to her age and possibly a heart condition. Tonight after her second dose she is having significant tremors and now loss of balance. I am now CONVINCED it is from this medication and she will not be taking this nor any other flea meds for the rest of her life. It's not worth it. What a shame that we only research meds after something goes wrong. We should be able to take our vets advice. Rallye will make it through this.

Gave our 23 month old Black Lab. Didn’t notice anything with first dose. She has had tremors, very lethargic, drinking lots of water. Vet said they don’t think it has anything to do with the Simparica. That is the only thing that has changed in her routine. Advised I could call Simparica for reimbursement or to report side effects. Advised her to put a big note on our account that she is never to have this again. Nothing they can do for her she said. If she had just taken it they could give her Charcoal. I hate giving her these drugs in the first place but am always convinced it is the right thing to do.

I will not in good conscience continue to give my three previously healthy dogs anymore Simparica Trio as it causing Gand Mal seizures in my older dog and nausea , vomiting and severe thirst and dehydration. This is lethal medication for dogs and should be taken off the market now.

I feel so bad ,my 8weeks cockerspaniel hasn’t been the same 24 hours of giving first dose of Simparica trio.My boy has been distressed with lethargic conditions,sleepy and peeing . Although the mother that took the same had not shown any effects.

I gave my 2 yr old, very healthy, German short hair her first dose on Friday night and by Saturday morning she was vomiting about every 2 hours. It’s Sunday night and still vomiting. I wish I could get it out of her system

Our 6 year old, 66# Treeing Walker Coon Hound baby has been taking Simparica for about two years. This past October he just wasn't the same. No running or jumping, Continuously wandering around the fence line of the back yard. Head down, tail down, will stand in a corner and stare at the wall. I have to turn him around and lead him away. Not drinking any water but drooling and swallowing all the time. No problem eating. Has started to stumble and sleeps 10 to 12 hours at a time. Snores like a big dog. Eyes roll back. Very "out of it". Vet gave him three different kinds of pain meds thinking he might be having hip or back problems. He has never acted like he was in pain. No diarrhea or vomiting or seizures. Lethargic and confused. Sometimes I think he is either blind or deaf. May not be from this med but too strange to at least not think about it. Will be back at PetSmart on Monday.

Our pups had been on next guard and heart guard with no issues but new vet stopped selling those products so switched to to the simparica trio - gave a dose to our 7 ur old 71 pound blue tick coonhound Frazier and our 10 mo 45 pound labradoodle- Watson. On Jan 4th for the first time
Watson threw up and continued to a couple more times -and seems ok now but Frazier a day or so later had a gran mal seizure lasting almost 2 minutes he had another one the next morning a small
One - he has not been the same since - he has tremors has fallen down is confused and appears to be blind in one eye now and just paces over and over
He does eat and drink comes when you call him sits lays down when told and still loves his treats but does not seem to enjoy his chew bones any longer and is just not the same loving silly active boy he has always been -
We are on day 13 and I want to know has anyones pup had improvements as time went on getting this poison out of their system?
I have been giving him blueberries bananas and cognitive therapy treats - to help with clearing the toxins and such
Are there any other suggestions or methods that have worked on healing their pup successfully from this poison besides time?!
My husband is convinced that the damage is irreversible and we should let him go but I am having a hard time and trying everything I can research or think of to pull him out of it.
Like all of you I am so heartbroken over this and so angry - why is this poison even scripted to fur babies?!

On 01/07/21, we gave our 11 year old black lab, Rawley, a 2nd dose of Simparico TRIO. A few hours later, he began vomiting nonstop. He could not hold down any food or water. The next day, we took him to his vet and had several tests ran (x-rays, bloodwork, etc.). He was given fluids, anti-nausea meds, meds to assist with the inflammation of his esophagus. After seeing his condition worsen, that night we took him to an after hours urgent care. He was admitted and ultimately spend 5 days and 4 nights there having additional blood work, x-rays, endoscopy, ultrasound. After he was sent home, he was still not well and barely able to hold in any food and had to take any fluids intravenously. A week and a half from taking the drug, he is still on 3 meds, taking fluids and starting to gain strength and eat food and drink water in very small amounts. All said, we are over $8K into vet bills and growing, Given that he had no noted medical issues prior, his vet and the urgent care vet both feel is was likely the Simparico. Needless to say, we will no longer be giving this to our lab or our other dog. I have written to the parent company that makes Simparico (although I don't hold high hopes that I will ever hear from them) and also signed an online petition at Change. org to have this poison recalled. I hope these steps will prevent anyone else's pet having to endure this.

Our 3 mo.old Boston Terrier, 10 lbs, had her first dose of Simparaco yesterday. the vet suggested it because she has hookworm..This morning she was shaking and no appetite..After reading all these comments I am scared to death for her. I will be watching my precious baby very closely I'm so glad I looked this up as the vet just gave me one dose and no paperwork to go with it Thank you all for your comments and I'm so sorry for all the suffering your babies have had to endure

My dog has been vomiting with diarrhea plus he has bumps all over his body from one dose of simparica trio. I am also very worried about him. I will never give another dose to him!

I have been giving my lab puppy (6 months old now) Simparica Trio since October. She hasn't had any of the diarrhea or eating issues, but has had one of her eyes that gets red and the inner eyelid partially covers her pupil. It seems to coincide with the monthly dosage. Anyone else have the same eye issues? I have a vet appointment tomorrow to figure it out.

I started giving my aussie shepherd simparica at 4 months. The next day she had diarrhea. I called the vet and she gave me anitdiarrhea medicine. It went away, I thought the diarrhea was from some of the junk she eats off of the ground. My shepherd got it the following month and I called the vet again and she prescribed probiaotics and anti diarrhea meds again. It went away. Then I gave it to her again the 3rd month and the same thing happened. I realized it was from the simparica. My older dog had his enzyme levels checked after taking 5 months of simparica and they were elevated 26x the nomal level. Im going to another vet and discontinuing simparica.

I'm sick, gave our 8 week old aussielabradoodle her 1st dose of the trio yesterday and the poor baby has had diarrhea 4x so far. I made some chicken and rice. She will not get this anymore.
Going to call the FDA on Monday to give them a report, the pharmaceutical company and the vet. I spoke to someone at the emergency vet office last night, they suggested the chicken and rice for today. I'm hoping that works.

My 5 year old, healthy Australian Shepherd had a check-up + boosters at the vet on January 24th. He also had a blood test done and all was normal. The only thing the vet told me was that his ATL liver enzyme levels were just slightly high (170) and it wasn't a concern and we could just do another blood test at his next check-up. I have always been apprehensive about putting my dog on Heartworm / Flea Tick medication because of horror stories, but I thought he's 5 and it will be from the vet and it seems like the responsible thing to do. He had ONE dose that evening and completely lost his appetite within a couple days. He is sometimes picky with his food, so I mixed in some green beans, etc but he stopped eating anything and had bright orange diarrhea by the 31st. I took him back to the vet and explained my concern that it was from the Simparica Trio and they didn't seem concerned that it was the issue. They did a blood test (this is literally 7 days later) and his ATL liver levels were off the charts at >2000. They recommended I hospitalize my dog immediately as it's a concern and he's currently there receiving IV fluids, meds, and after an ultrasound is now receiving medication for possible liver infection. My dog was HEALTHY and HAPPY prior to giving him this drug and literally days later he is struggling to recover. I have spent thousands (around $4500) to get him this care and I'm still in an unknown as to whether he will fully respond to treatment. I immediately filed a case number with Zoetis and informed my Vet as well as current Vet hospital he is being held at. There is NO other explanation for this rapid decline and the only change has been THIS drug. Best case scenario, he is able to come home, but we aren't there yet. My vet never informed me of any issues with this medication and I'm kicking myself hard now after reading all of these horrible experiences with everyone's fur companions. I won't be letting this go and I'll be actively pursuing recourse from the manufacturer and vet in any way I can.

Gave this flea medicine today and by 10 pm toy poodle having siesures every 3-10 seconds. My 3 other poodles unaffected. Will never use again.

Banfield Hospital pushed" Simparica Trio" on our 16 year old Toy Poodle which caused a neurological disorder of sundowner to the point of him having two days straight of constant seizures, repetitive pacing and extreme agitation. We took him to a emergency Vet Hospital that pin pointed Simparica Trio as the main facture that triggered his controlled seizure episodes in having constant all day tremors & seizures hurting him to the point of making the decision to put him down or have him continue with the pain until it killed him. In total we spend around $780 trying to control/stop the tremors & seizures. Thank you all for speaking out on Simparica Trio that Bandfield Hospital pushed on our Toy Poodle.

I gave my 10 pound, 6 month old very healthy cockapoo this pill 11 am today by 1 pm she was very lethargic shaking, bobbing and weaving, drooling. Lost all appetite. It is Now 3 pm and Lily is on her way to the animal hospital and most likely going to have to spend the night, we will flush her with iv and hope It helps Flush It out Of her system. AVOID THIS PILL! She will never have this again, I can assure you!

I started using this for my 5 year old black lab in October 2020, So she had 2 doses and in December she became very sick vomiting and would hardly eat and had a hard time walking up the steps...Took her to the vet and she couldn't find anything wrong with her. She gave her a shot to keep her from throwing up and took her x-rays and told me to come back the next day if she wasn't better. She didn't make it to the next day and died overnight. The vet came and picked her up and cut her opened and said and told me she could anything wrong with her so it was either she was poisoned or it was a neurological disorder. Something I will never know what happened to her...If I knew this would kill her I would never had used it

My little Billy Boy had his first visit to the vet and they gave him Simparica Trio. It started working on him right away, Diarrhea. Billy Boy is a 9 week old Daisy Dog. I was furious with the drug and the prescriber too. I will never give him this drug again.

A terrible way to start his life with me. He is ok for now though. He is just sleepy.

Our golden retriever had his first seizure after taking Simparica Trio last October. We took him to the animal er and they checked his vitals and he was fine. A month later, he was at doggie daycare and we picked him up and he was panting frantically. They had no clue what had happened so again we took him to the er and he checked out fine. Then we seen an ad on tv for Simparica and it mentioned seizures as a side effect. We asked our vet, but he ignored the question. Again our dog had a major seizure in January and we searched for a neurologist ear by. He had an MRI and it came out good. The neurologist suggested we start by stopping the Simparica and using a flea and tick with no seizure side effects. We hope this will solve our problems and he can live a healthy and happy life.

My best friend's new puppy has had diarrhea for 14 days after taking one dose of Simparica. I hope it is taken off the market and request that anyone on this thread with a pet who has suffered due to this drug goes to this link from the FDA to officially report their pet's adverse side effects: https://www.fda.gov/animal-veterinary/report-problem/how-report-animal-drug-side-effects-and-product-problems

In lieu of a class-action lawsuit, this seems to be the appropriate method to get Simparica out of vet offices and suffer some sort of consequence.

Wow. It is really eye-opening to see everyone's experiences. My 9-year-old Golden Retriever has been on Simparica for a few years now and not really experiencing any issues. But he had a terrifying seizure when I was out walking him on December 26, 2020 with no previous known history (he is rescue I've had since he was 2). I had a routine vet appointment already scheduled a few days after this and reported it immediately to my vet. She wanted me to monitor him carefully and wait to see how he did on his next dose of Simparica before continuing to prescribe it. He seemed okay with his next dose January 1, so we renewed the prescription, and I gave him the February dose too. I have noticed that recently he seems to stumble a little from time-to-time. With the March 1 dose, on that day, I noticed him seeming to be very fearful and flinching on several occasions. And a bit more stumbling. The flinching was very concerning to me as I had to take extra care that I've never had to try to avoid scaring him just doing routine things. I was reading that this drug enters the bloodstream quickly after giving it, and these symptoms and all the other reports have convinced me that I'm done using this on my pup. It's not worth the risk of additional seizures or other neurological effects, and it seems that his stumbling and getting tired sooner on walks are likely related.

I've been skeptical since his (Loki 65 lb rescue mutt) first dose about 5 months ago...I read the seizure warnings...he normally doesn't move much at night and since starting Simparica, he seems to have tremors. He also got that odd cough here and there that I read someone else mention. He also had a seizure that lasted for about 2 minutes in the middle of the night about 2 months ago and it was the most horrifying thing to watch and feel so helpless. I will be discontinuing the medication. I hope it has no permanent impact on him. I could never forgive myself.

This is an eye opener for me! My 3 month old shih tux Juno took her second dose last week and for the last two days she’s vomited and has been eating grass nonstop! I couldn’t figure it out until I googled all the medications the vet has prescribed for her then I came across this forum and I am pissed!! I lost my previous bichon poo to seizures 2 years ago and I don’t want to go through that type of pain and lost again! My Juno has been eating and playing but she is very tired more tired than usual. I can tell something is off with her I just couldn’t figure it out. Thank you to all of you posting and I hope all of your babies are doing well. And for those who have lost their fur babies I am so sorry for your lost.

OMG - I am so mad at myself for not doing more research. My nearly 14 year old Havanese Kokomo has taken a sharp decline in the last 8 month and I was blaming it on old age when I think I may have been poisoning him. I am so upset - I gave it to him last week and he had an accident in the house. He is stumbling, not able to stand on tile or go in and out of house without tripping on steps. I was blaming the tremors in his back legs on the fact that he has had both ACLs repaired. He seems to be out of sorts, staring into space, getting freaked out when he can't see me (I thought he was losing his eyesight). I am so mad at myself and so upset that I am the one that has made him sick. How do I get this out of his system and what are you using instead? Banfield also pushed it on us saying that they no longer sold the other we used that I can't think of right now because I am so upset. I am more than upset, I am effing pissed, my poor little boy.

I just found these comments and I am feeling terrible. I just gave Bentlee my Akita Simparica Trio on the 9th. No seizures yet thank goodness, but he is drinking a ton of water. On the first day he woke up and peed in my bedroom floor. He has never done this, and when I heard it and woke up he couldn't stop. I had to put him laundry room for the night (no Carpet). He hasn't eaten since and grazes on grass like he is a goat. I let him back in the bedroom yesterday all went well, then this morning I woke to him peeing in the floor again. Bentlee has been fine for 12 + hours in the house while I was stuck at work and never a drop of anything in the house. 1 dose of this Simperica Trio and he is completely different and cant hold his pee. 13 March he is also very lethargic and sitll not eating (even his favorite treats). For Instance he has never liked grooming, I brushed him out last night and he slept through the whole thing. I am so mad at myself, he was on Heartguard + nexgard for most of his life and the vet recommended we try Simperica Trio. I feel so dumb for taking him off of something that we had no problems with and it worked fine, just to try something new that he didn't need. Now I am terrified for his well being. Especially after seeing these post. I will never use this stuff again and will tell anyone I see buying it or using it my story and yours too. I hope for all of you that your pets (loved ones) have improved, I know the feeling of total helplessness to help them and all you can do is wait and hope. I am also going to contact the vet who gave it to me and tell him all this stuff. Bentlee trusts me an I let him down on this one.

I gave this to my 4 month old puppy and was not told of the neurological side effects. All they did was give me a pill in a bag with possible side effects of vomiting or diarrhea. Fortunately, no seizures but dark yellow diarrhea and puppy has been drinking water like crazy and peeing even while asleep. She has NEVER done that before. It has been five days and the diarrhea started on day 2. I have been feeding her some white rice hoping it improves. Will NEVER give this to my dog again. Topical only for me from now on. Really angry this drug is on the market and pushed by many vets. I read all the above and it makes me sad. I feel horrible for listening to the vet without researching this on my own. I thought maybe my dog had a bladder infection or got into something that upset her gut. Then I saw this and realized. 🤬

The vet suggested this medication for my 9+ yr old English Bulldog. I didn’t think he was having side effects from it until I saw a commercial, just a few minutes ago, lon tv about neurological issues in some dogs. I came across this site and read so much about symptoms that I now realize he has been having. He’s been on it for six months. He started having skin issues that the vet said were allergic reactions probably due to environmental things. They would clear up after a round of antibiotics but would return the next month. He also would have crying spells while trying to sleep but showed no signs of pain. Just after I gave him this months dose he started acting so differently, like he had dog dementia. Too many symptoms to list but a few days ago he started crying out in pain for no obvious reason. His motor skills have been affected and he’s been losing weight even though he eats heartily. He has been drinking more water then usual. I called my vet but because of Covid they are so behind in appts and would not see him until a month from then. I took him to the emergency hosp. but wasn’t allowed in with him. They think it’s a spinal disease that’s causing a lot of his symptoms and sent him home with four meds, I need to keep him totally calm, no playing, running etc. and to only let him out on a leash to go potty. Now that I’ve read all these comments I think he has developed these issues because of this trio medication. I left a lot out but didn’t want to make too lengthy post.
Just as I was writing this, my vets office called to check on him after getting the emergency drs report. I raised my issue about this medication as a reason but because the er dr said it’s a neurological and spinal issue they don’t want to think that. The girl said she hasn’t heard of issues like he has being a cause of symptoms being from that medication. She said she would have the doctor call me to talk about it.
Years ago when the new proheart came out I was talked into using it by a different vet. My six yr old pug immediately started foaming at the mouth, had seizures and got wished away by the vet. Long story short my beloved Emily died hours later when all her organs shut down. I had an autopsy done and it was because of that medication that she died. I swore I’d never try another “new” medication again but was told this medication we are talking about had been out for awhile so I stupidly said ok to it. If I’ve caused an early death to another pet I won’t forgive myself.

Please do NOT try Simparica Trio, I went to the Vets office to pick up Dukes Revolution Heart Worm meds, and they talked me into switching to Simparica Trio, we gave Duke his first dosage on March 1st, March 2nd, he would fall down while walking, he would fall down trying to get up, he's NEVER done this before! He just couldn't stand good, he constantly shakes his head. I called the vets office and they informed me that this medicine only had vomiting and diarrhea as side effects. It's now March 23, he still has falls but not like at first. I assume it's getting out of his system. I returned that medicine back to the vet and bought Revolution! I know Dukes problems were from this medicine, and it upsets me that my vet told me that this medicine was safe! Please do NOT use it!!

I am so incredibly upset with myself for trusting my vet and giving my dog this product. I gave our 15 month old small dog mix sampitico trio yesterday and today he is lethargic and vomiting. He has no appetite, won’t drink water and his mouth is so dry. I am so mad at the vet and think we should file suit against this company.

Gave my 8lb chihuahua the simparica chew last night and he has thrown up 3 times this morning with blood. Called his vet and they gave no information. Will not be using this treatment again!!!

Can someone please tell me if their dogs got better after taking the pill? My vet recommended this for my puppy, he is now lethargic, has blood in stool, and can hardly stay awake. He is 5 months old.

Has anyone recently started simpatico trio on their fur baby and noticed any kidney problems? For the first time in 12 years my dog has 6-7 large kidney stones which will require surgery. He has been dribbling pee and no longer has a stream and for obvious reasons is asking to go out way more often than his usual. I’m wondering if there is any correlation as we haven’t changed anything else with him.

Guys... my heart is racing... My 4 month old Aussidoodle (Emma) was just given a Simparica Trio ''treat'', and I was supposed to give it to her today (as she had shots yesterday). Well, let me tell you: THANK YOU ALL FROM THE BOTTOM OF MY HEART. I called the owner of my puppy's mom and she told me that the mom NEVER eats that stuff. She uses drops 4 times a year on the top of the neck for fleas etc... and told me to address the heart worm problem with the vet. So, again, tears in my heart, THANK YOU ALL SO MUCH for your generous information. Good bless you all.

I wish I would have seen this conversation before giving my 8 year old Labrador Retriever his first dose of Simparica Trio on Wednesday March 31st! We received the first dose of this medication from our Vet! Thursday morning was an awful beginning of the day for our boy. He was vomiting, had diarrhea, urinating constantly and the very scary part were the uncontrollable tremors. I thought right away it must be the new meds! It is Easter Sunday and he still has diarrhea and drinking a crazy amount of water. I had placed an order with Pet Meds for the prescription before I saw any of these side effects....I will be returning this medication and order Heartgard and not sure what we will do for flea and ticks, since he turns his nos Simparica Trio, e to the Nexgard and we really don’t feel safe with our Grandson around the topical or collar🤷‍♀️Any suggestions? Our Vet suggested Simparica Trio!

Just gave 3yr old OES first dose yesterday (her half sister got one too) and today she has uncontrolled urination.
The only "new" thing in her environment/diet is sipatico trio. Hell of an investment we made just to hurt her.

Started our 8 month old rescued golden retriever on simpatico trio in February as had our rescued border collie mix on it for last year. Started in February and within a couple of weeks ears started twitching. Vet thought was inner ear infection now thinking otherwise.

Gave my Olde English Bulldog puppies Simparica Trio on 4/7/21 they are almost 4 month now. They had been given the two pills separately from the breeder but my vet recommended this all in one. One has done great only notice that he is drinking a lot of water. The other has had diarrhea every since 6 hours after the pill. He is very whinny and is drinking a lot of water. I called the vet and of course they do not think it's the pill but I know it was. He had never pooped in the house and now he does every time he has to be put in his indoor pen for us to leave or sleep. I will not be giving this medication again!

My 11 year old terrier mix has been weak, uncoordinated and pacing up and down the hallway most of the day, sometimes stopping and staring at the wall. I gave him this medication last Thursday.
He already had idiopathic vestibular disease and I am very angry I wasn't warned that this should be used with caution in dogs with neurologic problems.
It's really too bad that vets are so easily swayed by pharmaceutical companies and don't listen to clients like us.

My Pomeranian is on a steady decline after taking 1 dose. Within 24 hours, he would not leave my bedroom, slept all day, no appetite. Called vet and was advised chicken and rice by tech - vet did not come to the phone even tho I asked to speak to her twice. He seemed to get a little better over the next week until he woke at 5am vomiting and having diarrhea and very lethargic. Another call to vet asking for an appt - seems like an an emergency now? Sorry, can’t see you for 4 days. Went to a different vet, within minutes he found a large mass on my Pom’s abdomen. Coincidence? Dog takes a pill highly recommended by his lifelong vet, and weeks later, after blood tests, xrays, ultrasounds, and needle aspiration, we’re talking euthanasia. I have 3 other dogs - large breeds that also took 1 dose, but no reaction. They won't be taking another dose, I cannot recommend this medication ... especially if you have a small dog. My heart is broken.

Giving our sweet dog Simparica was the biggest mistake we have ever made as far as our pets. She became very neurotic, so many changes in her personality and she became very anxious her first and only dose was in November 2020 she never returned to the special dog that we had and she passed in March 2021 at 8 years old

Just gave this to my 2 year old 77 lb boxer 5 hours ago and I'm SCARED! She's pacing and wants to eat grass. Vet said if she vomits bring her in. I wish I could get this out of her system now. Is it too late?

I gave this for the first time to my hound and about 3 hours later, she was very unsteady on her feet, eyes half shut and then had 4 episodes of breathing rapidly that each lasted 30 seconds or so and all happened within a 30 minute period. It has been one week and she has been acting very anxious since. It is like night and day compared to her regular personality or demeanor. It was a mistake using this and I hope that in 4 weeks when it is out of her system, she will return to normal.

I’ve read these stories and am also disgusted. Our 9 month 5lb Morkie was prescribed this garbage and we noticed the shakes, his lower lip quivering, and he looks around as if an invisible fly is flying around his head. It hurts to see this and infuriating to know these stories are out here and we did not do the research before giving our little guys this poison. Two quick questions...Do the dogs eventually return to normal? And how long for this sheet to get out of the dog’s system???

I have a happy healthy 14 yr old female bull terrier. At the vet today, I bought a single dose of Simparica Trio to try instead of Trifexis and Combogaurd, because they seem less tolerated by her now that she is older. We live in Texas and I have only used an isoxazoline preventative when insect populations get out of control in my area, like they are now.
After reading this message thread and some other online reviews, I have decided to not give this to my dog. I believe insecticides should be used to control pests in the environment local to the dog, and only on the dog herself as a last resort. Keep the yard clean, grass cut low, eliminate standing water, stay indoors during dawn and dusk, and commercial pest control will greatly reduce fleas, ticks and mosquitos. Talk to your neighbors, especially if they have pets or children that play outside. Outdoor pest control is a community effort.

Vet prescribed this for my 12 week old border collie Lab mix. 24 hours after, we noticed diarrhea. We did not make the connection until today. 10 days after taking Simparica, she started having muscle tremors. They have become so bad that she cries and whimpers any time she is laying down. She is absolutely miserable and we're hoping she makes it. Our two year old dog took the same thing and thank god she has no symptoms. Thank you all so much for this thread and giving me hope.

I gave 2 of my older Labs a dose of Simparica on a Saturday. 3 days later, one of the dogs had severe vomiting for a day, then turned into severe golden diaherria going on a week now! He is starting to get better. My other Lab after 5 days started having severe diaherria (black at first, now golden) and now throwing up too. I sure hope he makes it! They both got similar issues and this was the only thing they both did. I have another dog, but gave him Frontline and he's fine. Last year I gave them this but didn't notice any issues. Plus I spent a fortune for the crap...

We gave our Pomeranian the first dose of simpatica on 4/30 - yesterday (5/11) she had a seizure and just had another one tonight. I’m petrified after reading the comments here. Has anyone’s dog stopped having seizures when the medication wore off or is this going to be a permanent issue possibly getting worse? I’m beside myself with guilt and fear.

My 2 1/2 mini goldendoodle has been on Simparica 10 days now. At first B seemed fine. 2-6 days in vomiting here and there. Now tremors started. So scary. Consulting vet and will not give Simparica ever again. Be aware! This seemed like perfect treatment 3 in 1 but at what cost? Previously B was on Heartgard and Advantix worked well I guess we switch back. Any other alternatives that are not harmful?

Oh my god I'm so glad I found this group. My 1 year old Italian Spinone puppy has been losing hair on her back and has a big ear infection. I only stumbled on the side effects of this drug via a post on a Spinone group. My sincere sympathies to those with horrendous seizure side effects. I'm kicking myself I didn't research this drug. My dog is on a "health care plan" with my vet. I'll be calling them tomorrow. There is a petition in Australia to have this drug banned through change.org, which I've signed. I'll be spreading the word.

My 10 year old Standard Poodle had one dose of Simparica and had seizures two weeks later, which was yesterday. He is still not himself, walks very slowly and is definitely not feeling his best. He had full wellness exam three ago and was in perfect shape. I called the vet and am putting him back on Heartgard and Nexgard.

I gave my dog his first dose April 8th. About 2 weeks later he had tremors, drooling, lethargic, uncoordinated, vomiting and was touch and go for a couple days. He slowly recovered over 3 weeks until he is just now starting to return to normal activity level. Hoping we don’t have any more issues and will not be giving this again.

We gave our one year old Simparica tonight and he started having trimmers that lasted on and off for about 30 minutes. Not sure what effects he will continue to have. Please do not use this drug.

My baby is so sick from this Drug. She won't drink E walk or anything The doctor seemed to push this drug on me because the kombi guard was on back order. What do I do?

I don’t know whether it’s a coincidence or not, but 4 days after second dose of Simparica Trio, my dog ended up at an urgent care with blood in his urine. He is a 89 lbs 5 y/o pitbull who has never had any issues before. After second pill, we’ve notice he has been a bit down for a couple days. Now we are waiting for the verdict: whether it’s an infection in his bladder or stones. So far, the cost of diagnostic tests are about $700. There is also a chance that he’ll need a surgery. I am almost 100% sure that all of these symptoms are caused by this medication. I would not recommend giving Simparica to your pets!!!!! I will never give my dog this medication again. I hope this comment will save you and your pets from unnecessary trouble. Stay safe!

My 2 year old Shepherd was perfectly healthy in Feb. and by April of this year he quit eating, excessive thirst, excessive urination, low platelet count, low red blood cell count is unsteady and now is at a vet hospital and so far we have spent 2000 and they do not know what is wrong with him. The only thing we changed after his checkup if Feb. was his flea and tick treatment. Reading all of these comments I too think it is the drug that has caused his body to be toxic for him. He is also running a fever so is not out of the woods.

I have an 8 year old Labrador. She has been taking Trifexis for years with no problem. Vet suggested that I switch to Simparica Trio (he gets a kickback from the manufacturer). He said it would take care of ticks and Trifexis doesn't. So I did. She was ok for awhile, then she had a seizure and started throwing up all over the house. Then she lost control of her legs and couldn't walk or stand. Next she developed severe tremors. She was shaking like she was freezing. She was terrified and we were too. We immediately gathered her up and took her to the vet. The vet recognized immediately that she was in severe neurogical distress. He did blood work and found that the phosphorus levels in her blood were way to low and that was causing the neurogical problems and it was most likely from Simparica Trio. Two days later, she is doing better, but not 100% yet. I regret putting her on this drug. Trifexis is much safer and I really don't care about the ticks - I can pull those off. I'm more concerned about fleas and heartworms and Trifexis is just fine for that.

I wish I would have came across this before I gave my healthy 9 month old puppy this medication two days ago. The day I gave it to him, he was up all night just randomly crying and yelping like he was in pain. I took him to the energy vet in the morning, he couldn’t find any cause for pain, only he yelped a bit on his neck, they had trouble getting him in, he was yanking his neck around as he is afraid of the vet since getting fixed. The only thing the vet can say, was a sore neck. I had a trainer come in the day of, and he was with me the all day, NOTHING a happened for him to be in pain! Anyway, he prescribed him pain relief for 7 days. He has no appetite and very little drinking either so he’s not using the bathroom much. He is not the same puppy prior to two days ago! I will keep a close eye on him and hopefully nothing else come about, we will NEVER take this medication again!

Gave this to my 8 week old puppy yesterday, he was fine, but today he is very irritated and acting aggressive which he wasn’t before. Has anyone else experienced this?

Gave my 3 year old Yorkie Simparica and 24hrs later he became hyperactive panting pacing and started hiding in dark places. This is not at all his behavior. Took him to the vet Potassium level was so high they did an ekg and his heart was not beating regular. They gave him IV glucose to raise his Potassium level. Currently we are monitoring him closely-he’s never been sick. Reported this to FDA today-

My 14 year old was up on simparica about a year ago and her whole demeanor has changed. She is lethargic, unsteady on her feet, doesn’t bark at all, showing signs of dimentia. I thought it was just her aging but now I think it al started when she started this medication. Any tips on how to flush it from her system ? Or has it been too many doses ? 😞

I gave this trash to my 5 month old JRT yesterday. Today really soft stool (not diarrhea but close). He is pissing a lot and often and drinking a lot of water. What scared me and caused me to start doing some more research is while drinking he stops and acts as if he has a lot of peanut butter in his mouth. I guarantee he will not take this trash again. I’m going to keep a close watch on him over the next few days. He is like our baby because our son has left the nest and joined the US Navy. Any believers out there please say a prayer for our pup as I will for the people on this thread.

Hi, I’d like to thank all the contributors to this thread and I’m so very sorry for the pain you and your pets have undergone. We have a 3 month old Aussie labradoodle and the breeder warned against oral flea meds.

Our vet prescribed this medication and after reading this thread I asked them to exchange it for just the heartguard. I can’t believe that the Number of incidents here are a coincidence.
Thanks to all of you for sharing your experiences- my pup and I are very grateful.

I rescued a dog that had a light case of heartworms. The Simparica was recommended by the vet. Gave it to my dog on Thursday night and Sat stools were soft. By Sunday he is having liquid diarrhea! Does anybody know how long this will last?

The vet told me to switch to Simparica trio after they stopped seeking revolution which he had been on for many years. I gave this to my 8 yr old chihuahua and a couple days later he started having seizures. Somedays he will have 2 and then he will go for a couple days without having any issues. Work up from the neurologist shows all his tests came back negative. This was the 2nd does I have him. Did anyone see any signs of improvement in their dogs? If so how long did it take? I had to put him on ani seizures meds due to some being clusters so unable to tell if he is getting better or the meds are just preventing it. Neurologist doesn’t seem to really know if the effects are long term or not. So sad as he was once a happy healthy dog with no prior health issues. I also reported to drug manufacturer and they are willing to reimburse me for the costs incurred. If this is a long term issue, I doubt they would be willing to cover all visits in the future.

My 6 year old Chihuahua has been on simparica trio for 4 days .
He started with vomiting about 8 hrs after his 1st dose, then diarrhea started. I had to make him chicken breast and rice, (bland) because he won't eat his food. When he goes out he eats grass. All he does is cuddle in his blanket. No more of this for him. He isn't his playful self.

I gave my sweet little toy poodle Simpaica today, and one hour later this poor dog went from happy and healthy to having a terrible seizure. The seizure has finally stopped and he seems to be sleeping peacefully. I sure hope we don't have ongoing problems. No more of this junk for my pups!

I gave my sweet little toy poodle Simpaica today, and one hour later this poor dog went from happy and healthy to having a terrible seizure. The seizure has finally stopped and he seems to be sleeping peacefully. I sure hope we don't have ongoing problems. No more of this junk for my pups!

I gave my 15 year old dog this medicine. This medicine is making her shaky/tremor, anxious, and she is panting a ton. She still has her appetite at the moment. I am convinced this medicine is HORRIBLE and is causing this. My poor baby! Does anyone know of anything we can give her to help get this out of her system? HELP!! I am so worried about her!

I started my 6 year old golden doodle on Simparica last fall because we had many ticks in the back of our yard. Later in the fall I noticed some leg tremors when she squatted. Since the weather was turning cold, I stopped giving her the Simparica until spring. Unfortunately, I didn't realize the tremors were possibly caused by the drug. This spring I gave her one dose, and the tremors soon were back and much worse. I'm totally stopping the drug, but, unfortunately, can't get in to my vet for almost a month to get a replacement. However, doing nothing is better than giving her the Simparica. I'm hoping the tremors will soon diminish, since she is in great shape otherwise.

I called the maker of Simparica and filed an FDA case for my dog and told them all of the symptoms she was having from this medicine. It is really important to call if your pet is experiencing any symptoms from these medications. I took my dog to the vet today and she received fluids and gabapentin. The company is reimbursing for vet costs. If your dog has reactions to this medicine, push fluids! Also feed bland diet- rice, ground beef, chicken, cottage cheese. I’m seeing an improvement in my dog, and am crossing fingers that this continues!

I have already had a bad experience with "k9 advantix", so I refuse to buy over the counter drugs for my 13 week old Auggie. (toy aussie & corgi). I am extremely upset at myself for letting a similar but very serious threat get to my pup again. I originally wanted to get Nexgard, but for some odd reason, when I had went to my vet to pick it up, instead they gave me this. (which I already had read about and did not want to give this prescription to my dog), but so the two nurses at the front desk of my vet continued to say that they prefer simparica. Was not too excited about it, and I really should've declined it. The only thought in my head was to get home and give it to my puppy who has had few fleas, but many itching problems. I just wanted them gone and for him to feel better. He doesn't seem to be throwing up as much anymore, he did several times throughout the night though. And now that I'm reading all of these comments, a couple of hours ago, my puppy who I thought was sleeping, would be shaking and whining, (I'm used to him having bad dreams, and I'd wake him up from them). But I noticed that I had to "wake him' several times in only 2 minutes time, but he wasn't sleeping, his eyes were open and I saw them rolling in the back of his head! He would come out of it when I shook him, so I didn't think anything of it at the time. But now I'm almost convinced that they could have been seizures, and I just pray that they weren't, and pray that he doesn't have to experience anymore troubles.
I see that the active comments were over a year ago, but PLEASE, anybody who reads this and can inform me on any insight they have, please let me know asap what you think the deal is. I am so scared for my puppy. I just wanted him to feel better. Not worse

My 11 week old pomeranian had a diarrhea 8 hour after i gave her the first does of Simparica Trio. So I started searching and came across this blog and my heart just sank. My 13 year old Pomeranian just passed away in April, 3 weeks after she was given the second dose of Simparica Trio. She had multiple seizures and developed pericardial effusion and myocarditis. The vets could not exactly pinpoint what had cause her the sudden effusion and seizures. It could be something else that had caused her all the pain she went through but I surely will not give my puppy Simparica anymore and I hope she is alright. I will have to keep an eye out on her.

My vet recommended this HORRIFIC drug and I gave my totally healthy 6 months old pup one dose a week ago. That night he seemed a little uncomfortable, unable to sleep, and I didn’t think anything of it. For the next 3-4 days I noticed he would be a bit hesitant to jump or hop around and play as he normally does (and his appetite was lower than usual). It didn’t even occur to me it could be the drug as my doctor just gave individual pills and I didn’t get to read side effects. I would notice he gets super tired walking and would go limp in my arms. Then on day 5 my poor dog just couldn’t move. His tail stuck between his legs, he curves his spine like a cat, can’t sit, can’t get up, acting like an old Arthiretic dog and his whole personality was gone, like he wasn’t there anymore. I took him to the ER they checked his vitals and sent me home. Next day, he was suddenly 1000% worse, would not touch food, could not move. Took him back to the vet. They immediately denied they were in the wrong for prescribing because any meds can have side effects but I’m convinced this medication is poison. They want to test him for the MDR gene, put him on fluids and I have to take him in tomorrow for more fluids but he is not improving. His temp was high and white blood cells elevated. I’m so worried I’ve lost him forever and he’ll never recover. How can they put something that can cause this level of damage on the market and how do vets not even tell us to monitor our pets or tell us what the risks are. I’m beyond heartbroken, shocked, and sad. If anyone has suggestions or knows how else I can help my little guy please let me know. I check this thread regularly and I’m sooo grateful to all who wrote. Thank you!

Doesn't anyone here wonder why?, if this is sooo safe to use with mammals, isn't there a human version also available? Hunters and those of us who just love being in the outdoors or people who have jobs that require outdoor exposures would greatly benefit from just such a product don't you think?, YET, there isn't one considered safe for humans. If fact it specifically states on the product label "Not for use in humans". Really? and you expect people to give this to their beloved pets? Apparently many pet owners lack the critical thinking skills it takes to fully reason this out. The company's thinking must be the profits outweigh the loses from any lawsuits lost... its important to note that the law treats animals as property and the fix value of a dog is quite small and limited. Humans are another matter. Please think these things through before subjecting your pet to internal insecticides. Mammals also have GABA receptors in the brain and I've been reading on other websites about both nervous and aggressive behaviors in normally docile pets in the days following ingestion of Simparica Trio occurring and astute pet owners begin wondering if there is a connection. This excerpt is from the healthline website and in reference to humans "GABA is considered an inhibitory neurotransmitter because it blocks, or inhibits, certain brain signals and decreases activity in your nervous system. When GABA attaches to a protein in your brain known as a GABA receptor, it produces a calming effect. This can help with feelings of anxiety, stress, and fear." Sound familiar? this is how Simparica works on insects who bite your dog. This is taken from the article printed above all these comments "Simparica works by impacting the nervous system of invertebrates such as fleas and ticks. The innovative formula disrupts gamma-aminobutyric acid (GABA) and glutamate receptors, which both play a role in nerve transmissions. GAGA-gated channels help to calm nerve transmissions, which sarolaner alters, creating an influx of nerve transmissions. At the same time, it opens glutamate-gated channels, which adds to the flood of nerve communications." Now do you get the connection? Contrary to the statement in that same above article "The results are fatal for fleas and ticks but safe for mammals such as your dog." This is apparently not true and that's why the article never goes on to explain exactly why it only works on GABA receptors in fleas and ticks yet not affect the GABA receptors in your dog. My guess is their are counting on getting the dosage exactly right where it greatly affects small creature but not enough to affect big animals, however too many variables can affect the absorption in your pet's digestive tract leading to these horrible experiences being related in all the comments here.

I gave my morkie poo simparica trio from age 4 months until age 1 on advice of his vet. Initially I noticed minor tremors and twitching when he slept or was just relaxing. I did some research and because he seemed otherwise fine, I assumed it was "small white dog" shaking due to his breed mix. But then the first time I increased from 6mg to 12mg (again on advice of the vet) as his weight increased, the tremors got noticably worse and he started stumbling for no reason. I called the manufacturer (Zoetis) and filed a report, immediately discontinued the tablets and started to detox him. Zoetis claims it will be out of his system in two months and I should not see lasting effects, so I am hopeful but worried and telling everyone I know NOT to use this poison.

I gave my yellow Lab, Sophie, her first Simperica trio. A couple of weeks later she had lost weight from not eating. I tried everything but she just didn’t have an appetite for anything. She has been diagnosed with thyroid problems and myocarditis. I’m not sure if the simperica is the cause. I do know that she was a healthy and somewhat energetic 10 year old before the treatment. No more Simperica for my dog! This drug needs to be pulled off the market!

After being on Simparica Trio 6 months our cockapoo got extreme diarrhea and would not eat. Her protein levels dropped to almost nothing and stomach filled with fluid. She was being seen by her regular vet and was put on antibiotics. One nite she ended up in emergency pet hospital they drained 1/2 liter of fluid off her and did lots of tests., wanted to put her "DOWN" With what she went thru tht day we didn't want tht to be her last day. So we went home with her on steroids and more antibiotics and denamrin for liver. We are now back to regular vet with bloodwork every two weeks and still on meds and diarrhea but not as bad. With Entyce she is getting her appetite back and seems a little better. It's been a little over two months since her last dose and feel certain that is what almost killed her. We go for more bloodwork today and are praying for better news. We have spent well over $5000.00 and upset about all the horror stories we are now hearing.

Hi i have only had my pup for about a week and a half i took him to vet and asked what would be safe to use since my pup is only about 11weeks old and weighs 4pds (prob less today) i gave him this medicine last nite and wish i would have seen this post sooner Now i pray he makes it thru the night. Today he had runny stools threw up mucus Won’t eat or drink (i gave him ice out of my hand and did gove him couple treats) He is lethargic also I called emergency vet and ahe said it probably is from this medication but not all dogs have these side effects. I am so worried after reading these comments. Will it get worse Will he get better? In the meantime i keep trying to give him ice and i am very worried that i have permanently harmed him

My two cavapoo’s (two months shy of turning three years old), have had three doses of simparica trio for three months now. Yesterday one baby threw up four times within one hour of taking her chewable. The vet office called simparica hotline to find out if it was safe to give her another one. (My first warning sign right there). The office girl not the vet said if it my dog threw up within one hour after eating her pill - then it is safe to give her another one. So now after $90.00 spent on three pills this month, I decide to look up the answers myself. Shame on me for trusting the doctors that shrug off their responsibilities to the office girls for one thing. Both my dogs have had runny eyes and were eating grass all summer. Normal. I don’t know. But I have decided not to give the replacement pill today. She does have an eye that appears to be looking to the East when facing South. Oh Lord, back to finding another vet. I just wish I could find a vet who honestly loves my animals as much as I do. Seriously I have had the worse luck.

Just gave my doxie (Bruno) this.... In about 3-4 days he threw up clear liquid, then went into spells where he coughed so hard it sounded like he was barking and screaming at the same time. After reading all of supporting reviews, I will never give him this again. Couple of days ago, I took my other doxie (Maddie) into my vet, for shots, he did the heart worm test and recommended Simparica. She has been treated by this clinic since birth. She does have history of seizures. Why would he knowingly recommend this? I will be changing clinics immediately.

Hi there, my dog has been taking simparica trio for two months. He had his second dose on 3rd July. During this period coincidentally I have noticed a change in his behaviour. He has become more aggressive and has been growling at me sometimes when I try to move him. He also lashes at me with his teeth. He never ever used to do this. He was a dog you could pick up anytime and he was good as gold. It may be that he is getting older as he is now one years old and he was neutered about three months ago. He seems sometimes anxious and is sensitive to noise outside. He has been barking a lot more than he used to. It could be a coincidence but seems too coincidental. I am going to try stopping the medication for a month to see if things improve. Just wanted to share my experience in case anyone else has similar experience with dog's character changing. I also changed him over to a raw diet a few weeks ago too have taken him off of this again to see if raw diet is causing it. I hope we get to the bottom of it as this is not fun.

My vet recommended this for my Scooby he justed turned 8 on July 4 and had to take him to vet because of fleas since Monday when he got his first treatment of simparica he's been momping around the house and not eating his food. I will not be giving him simparica again.

My lab puppies have been taking Simparica Trio for 2 months. My vet recommended the tablet to save on monthly costs for flea and tick treatment. Saving money sounds great, right? My dogs have been throwing up since then and I could not for the life of me figure out why. They are also drinking more than normal. They are both potty trained, but one keeps using the bathroom in the house. After doing more research on their monthly medication, I will no longer use Simparica Trio nor ever recommend it. There is a possibility it isn't the cause, but it is the only reason I can find and it aligns with the stories of others.

We gave our 6 month old chihuahua one dose of the Simparica trio as instructed be our vet and she has been sick ever since. She had terrible vomiting and diarrhea for a week and also weakness and staggering three weeks later. I definitely will not poison her with this garbage anymore. I am so angry.

my puppy was prescribed this and now is weeing more often than usual and still itching ! all my dogs were prescribed and my eldest dog has had a strange reaction hives all over his body, panting, restless started same night he took the pill but has had the product on previous occasions with no side effects but this time he had a that reaction,had to administer meticam for the pain and antihistamines for the hives - he is still not right after 4 days and my other dog louie has always suffered from seizures since a pup vet say possible epilepsy - managed without medication at present and I do always try to avoid medication with him as they always make his seizures worse - I am so angry for not researching this further before .. I shall be looking for a natural product from now on, k and g pet supplies on amazon do a good mange spray so hopefully that will be all they need from now on. oh I should mention shadow is our 8 yr old dogue de Bordeaux - he has never had a reaction to anything ever before in his life and has never needed a vet so this was not usual at all for him ..

My beautiful Golden was switched from her previous Medicine to this one. She started it on 7/22. Today she’s been panting. Drinking water and peeing excessively. She vomited twice and became so lethargic that she couldn’t walk. She’s now in the Er. They are monitoring her. Her blood work came back fine. X-rays fine. I’m convinced the medicine caused this and now she can’t walk

I'm besides myself. My precious rescue has been sick twice, currently on her second episode. Made the pressured in to by a vet to give Simparica Trio. four times. Almost $4k in medical labs, hospital, ultrasound etc no answers. First it was a fake guess of Lyme (she's from Texas where Lyme is not) disease diagnosis and $1200 wasted. Tick titer came back a light positive which lab said was specifically false due to the recent lyme x2 booster i was scared in to giving. now almost exactly two months later, sick again with a fever and stops eating. Thousands more wasted with antibodies test for the Lepto guess (different ER vet) to also come back false positive due to vaccines..... my poor baby already had a rough life being abandoned. and now i'm on an hour by hour let's see if she will perk up. I feel like she's been an experiment to make others money. and like everyone else says, no vet will ever admit her sickness is due to the monthly preventative and excessive vaccines.

My vet recommended Simparica Trio for both my dogs (13 year old healthy Collie mix 7 lb chihuahua mix). I gave them their 2nd dose, and 24 hours later, the Collie mix (Bella) was throwing up, lethargic, unsteady, drinking obsessively, panting, and could hardly walk. We spend last night at the Emergency Vet, and all day today at her normal vet. They did an ultrasound (2 of them), X-rays, blood test, gave fluids, did another ultrasound (looking for a master fluid that keeps popping up and going away between her stomach cavity & spinal cord. They still will not consider that it is the Simparica Trio. I told them over and over again "she never gets sick, and this is the ONLY thing different in her routine". I even said "I am reading a blog, right now, with pages of stories about this drug and the side effects". They keep telling me that she would have been sick from the first pill, not just the 2nd. She's finally resting at home, but still not able to walk, run, eat, etc. I will NEVER give this drug to my dogs!

DO NOT give this poison to your pets. Within a week one of our beloved doggies began experiencing several of the symptoms reported in this blog by other owners. He's been in an emergency hospital for two nights, no signs of improvement despite blood transfusions and other symptoms. He's experiencing auto-inmune disease symptoms and we were told he is in critical condition. Vets have told us repeatedly that it can't be the medication. After reading all these reports I am convinced this is the reason our baby is so sick. Another one of our dogs also has had several episodes of suddenly crying as if she is in great pain and also began within a week of administering the poison (please don't call this a medicine, it is a poison intended to kill fleas and other bugs and in this case it can also kill your doggie).

I wish I would have read these comments first. Just gave my baby her first dose. I want to cry I wish I could get it out of her system after reading these comments. Stressing out now.

Was at the doctors 2 days ago for an emergency appointment. My French bulldog 2 years olds had a second attack in 3 days. His neck felt swollen and he was panting heavily gasping for air. He looked like he was having a seizure. The doctor did blood work and gave him steroids and said to watch him carefully for the next few days. Today the seizure like attack happened even though he is on the steroids. I started thinking about his history. A few months back he started with a morning vomiting always on his empty tummy. Then things got progressively worse. The only thing in his diet that really changed was his flea, tick and heartworm protection. Now Im scared ive been giving him Simparica Trio and it could be the cause of his progressively worsening sickness. Im switching back to the protection he used before Simparica Trio. It may or may not be the cause but I need to do everything in my power to bring my dog back to health. I hope I have found the culprit to his digression.

My dog has been on simpatico trio for 5 months .. and still got a deer tick .. I removed it immediately ... She just tested positive for Lyme's. Now I have to pay $100's of dollars on meds to check her antibody and possibly put her on meds for life . I feel the manufacturer should pay my test bills and meds .. my doc talked me into this regimine of meds and my previous dog did well on sorresto color and heart word med .. any clue on who I contact ? I'm so upset

My American Akita puppy took this pill on August 8th. On August 17th, we had to rush him to the ER because he was not moving. After the ER visit and a visit with our regular vet today, they concluded he is having neurological issues and that is why he cannot walk. I called the breeder, and she said some vaccines and heartworm meds can cause neurological issues. I just wanted to get another opinion before we move forward.

Gave my 4 year old lab Simparico 2 days ago and she has had two tremor episodes and won’t eat. Never saw tremors before. Read the package insert and it does list tremors and seizures as a side effect. Will not use this again and will warn others
Mmm

Buddy 8 year old male Boxer formerly energetic and playful. Started downhill health issues with initial dose. Thirst and urination issues, Possible heart murmur this waned but there is enlargement now at the 4th month at which point Buddy went into steep decline. Just after the 4th dose he started to collapse at his feeding dishes on the floor, next we raised dishes and he did ok for being shaky but continued to decline to the point where he could not use dishes , and now cant eat or drink. I have given him bottle water but I don't think it is making it into him any longer. Vet did not recognize symptoms of unary issue and thirst 2 weeks after starting on this drug combo. This was days ago when I could still get food into him and the result. https://photos.app.goo.gl/GbP8UmDNBAxJ1m4g8 I feel like we are just waiting for him to pass now.

This is so scary. I hope this product is no longer sold anywhere.

Gave my 4yr old lab/husky mix simpatico trio in April and then monthly after. Ekko then started having seizures in May,June and July. Stopped meds and he has had 3 more seizures since. Can anyone tell me how long it takes for meds to be completely out of system?

I am both incredibly sad and angry. Our dog was killed by this poison within 15 hours after taking one dose. We trusted our Vet when he recommended this over Revolution topical anti-tic/flea medication.

My girlfriend was told by her Vet to take these Simparica Trio pills that were meant for 44 lbs dogs and up and break them up to give to our three shih tzu dogs and one chihuahua. So one pill was split in four to give to them all. This was given to them in their food around 4 PM on September 7th. Within 5-6 hours one of the Shih Tzu's, Ozzy, started showing very unusual symptoms. We took him out to go potty and Ozzy was trying to go but couldn't. He then got very lethargic and was moving very slowly. He did not want to eat food or treats whatsoever which was very usual for him. This was all a very quick progression. He then started throwing up occasionally and then continuously throwing up after everything he drank. This was around 10 PM at night. By midnight he would just stand over the water bowl, drink water, then throw up. We felt so helpless. The next morning he was taken to the vet and passed away at the vet's office. We're looking back and wondering if taking him to the animal ER would have done anything, but after reading these experiences from dog owners who's dogs passed away from this, the doctors wouldn't have been able to do anything. What mechanism this drug is inducing on the dogs or what complication it's causing is completely unknown to veterinarians, not just the dog owners. We randomly, yes, RANDOMLY came across someone else at the vet's parking lot two days after who had a dog that had permanent neurological damage from this drug and was compensated thousands of dollars from Simparica Trio.

We were in complete shock, sadness, and anger for a 10 year old Shih Tzu to go from being a happy, healthy, quirky dog to being buried within 24 hours. It wasn't until towards the end of his life we looked up this new medication we gave them and realized that Simparica Trio was most likely the cause. Nothing else has changed in the dogs' lives. How can a vet recommend this knowing the side effects and high chance that your dog can die or have lasting neurological issues? How much are they being paid?

As for the other three dogs (2 Shih Tzu's and 1 Chihuahua), it's currently August 9th and they are showing mild unusual symptoms such as diarrhea, throwing up every other day, and coughing with occasional heavy breathing. I'll be updating on how they're doing over time. I'm reading through everyone's comments and everyone is dumbfounded on how something like this can exist and how easy it is to trust your vet when they recommend something as seemingly innocent as tic/flea/heartworm medication. Our dog was stolen from us.

I'm sorry I started a bit of a rambling and rant but I have been very emotionally effected by this.

Was prescribed Simparica Trio for my Catahula dog with no medical issues. The day after administering drug he had two incapacitating seizures. I returned to vet next day with him and was advised he was ok. The following day he died. This medication should be banned and the company held responsible. This dog was my partner and friend. He protected our livestock from coyotes for many years and I took good care of him. He was in excellent health prior to this incident.

I went to banfield hospital and they prescribed this medication for my dog and had thrown up non stop since he was given the pill and wouldn’t eat anything and he passed away 10 days later (yesterday). He wasnt throwing up at all until he received this medication

I gave my dog simparica at 10:15am. It's 5:53pm and he's acting very lethargic. And now I'm upset with myself for giving this to my dog without doing research. My dog has had 3 seizures in the past from wearing a flea collar. My vet is aware of this and prescribed simparica. I will post an update 7 days later. I wish every one the best.

I gave my 1 year old collie cross Simparica flea and tick medication. Next day she seemed different, standing slightly strangely. The following day she got diarrhea and was extreemly quiet. By the evening she lost the use of her hind legs. We rushed to the vets who said it had to be neurological and once I mentioned the diarrhea she looked into Simparica suspecting MDR1 with my dog. Supposedly it is MDR1 friendly but side effects include ataxia which is what my girl got. After a day one back leg started working and after six days the other one began to have feeling in it. Over two weeks later she still can not walk properly. She has what is called knuckling. The vet has reported it (at least she too thinks it came from the drug) and a chiropractor checked her for the possiblility of slipped disc etc and said it's not that. She has been very unpredictable and snapping at people but this is improving. I am feeding her foods such as spirulina; b12 and a special healing earth in her dinner. I just hope and pray she gets better. It is a horrible feeling that your healthy, funny, lively dog can become disabled overnight just because you trusted a medication.

I wish I had read these comments before giving this to my Frenchie. I should have know it was a sign when he spat it out. He has been very lethargic, he was an extremely playful pup. Twice I have seen his eyes roll into the back of his head (petti-mal seizure?) He is fully housebroken and just had a running stool accident in the house. I just want to cry!

Hello to everyone and I am so sorry we had to meet under these circumstances. I to also gave my best friend Simparica as recommended by the vet. All we want to do is take the best care of our animals and trust the people (Vet's) who specialize in this to do what's right for them. Instead it has become a world of greed. My 1.5 yr old German Shepherd was a happy, playful healthy dog until this Poison and now I blame myself for what she is going through. A day and a half after her 3rd dose of Simparica she had a really bad gran mal seizure and we though she was going to die. 24 hours later she had another one. After spending the day at the ER Vet where they did bloodwork and several x-rays all coming back normal, they sent her home with Keppra. She went 11 days with no seizures and then had another gran mal. Then a week later 2 more just 24 hours apart then a little over w week later she had 3 in 24 hours. The Vet's are so busy that even if you can get in you don't get anywhere. I called my Vet and waited all day for them to call back, useless. All they care about is the money and not the animal. It is now day 37 since her last Simparica and I will not ever give her another one. It has been 5 days since she had the 3 seizures in 24 hours. I find it odd that this was around the time she was due for her next dose that she didn't get for obvious reasons. She has good days and bad days but she is far from the dog she use to be. She is scared of her own shadow, walks into things at times, trips and stumbles, has become very timid, stares at the wall and has to have either me or my husband in sight at all times. She gets anxious and paces if I run into the grocery store even though my husband sits in the car with her. I hate that I did this to her and I hate that the Vet does not seem to care. I also am seeking information as to if there is a class action suit against this company because there should be. Even with what she has been through we have to wait until Dec 1st to see the Neurologist as there is only one in the State of Maine. I did find another one in New Hampshire but I know like everyone else that all we be negative just like all tests done so far. We are already close to $2000 in Vet bills not counting the poison we bought her. We were told the Neurologist would be between $10,000 to $12,000. Is it just me or does it seem like everyone is in this together? How can it not be the Simparica that did this to my baby when nothing else changed. After reading all these posts that sound so similar to what we are going through. I just cross my fingers every day that she will get better after this is out of her system. I know it's still in her system because I am still finding dead ticks that I miss because they are the size of a sesame seed. Ticks are horrible here in Maine. Please anyone let me know if there is a class action law suit or where we can start one? I don't want another animal harmed by this stuff, one animal is one to many. I am so sorry to all of you and my heart goes out to you and your babies. I will do anything to stop this from hurting or killing anyone else's baby. I won't sleep until we all get the justice for our babies that don't have voices of their own. #JusticeforCassie My thoughts and prayers are with you all as I go through the same thing with my beautiful Cassie girl.

my dog became extremely itchy all over her body. after a few months of this i decided to go back to Sentinel and Bravecto. Itching has decreased immensely. After reading all your entries, i'm thrilled i chose to take her off of it.

I sadly started my beautiful dog on Simparica Trio on May 1, 2021. By June 7th, she had a rash over most of her body, itching and biting herself to bloody raw spots. She had a beautiful coat of fur. She's a Brittany (Spaniel). She also started drinking excessively, and peeing in the house. She also started with ear infections. The vet insisted it was not from the Simparica Trio. She went on 2 antibiotics, and medicated baths twice a week. Her last dose of Simparica Trio was given to her on October 1, 2021. I am hoping it is almost all out of her system. She is healing and has no new rashes or sores. I am so mad at myself for letting the vet talk me into this. She had been on the Seresto collar and Tri-Heart for 8 years with no issues. Once she is completely healed I am putting her back on those. This was the only thing we changed, I am convinced this is what did it to her.

Simparica has caused my 12 pound 5 year old Jack Russel Terrior mix to have leg tremors and have trouble walking, jumping, or running. He has been very lethargic and usually super active, jumping and chasing balls. He has trouble raising his leg to urinate. Vet says Simparica is not the reason for his condition, but he was totally fine prior to taking Simparica!!

Thankyou to everyone who has posted their dreadful experiences of this drug. Was checking out before using . The whole packet is going in the bin !! Not even going to risk it .
Fleas and worms need to be managed but not like this.

Has anyone experienced cardiac issues while under anesthesia on this medication?

For 5 years I have resisted my veterinarian’s suggestions for oral flea meds. I had always thought how can something so lethal to fleas an ticks be safe to ingest? In a weak moment last week she prescribed Simparica for a flea problem my 5 year old Springer was having. We started the medication on Dec. 1st and 3 days later it started with vomiting and loss of appetite. She hasn’t eaten in 3 days and is unable to go up 2 simple steps. She walks around as if she is on ice with no control of her back legs. Been also very lethargic not wanting to get out of bed. Hoping that these side effects don’t get worse and subside soon . Called Vet tonight and got a first appointment for tomorrow morning . Reading all these similar cases can’t figure out how the hell this crap is still being prescribed. I hope and pray for no long term affects. For those who lost their dear companions from this medicine my heart goes out to you all. This sure seems like this happening way too often . I should have kept with my gut feeling about any of these oral meds.

I just started my 80 pound pit on this same medication yesterday. 12/18/21.. he did experience some diarrhea. Around 9pm he was barely able to jump up onto the couch and was extremely hesitant to go up the steps. This morning (12/19/21) was a bit better, still hesitant on the steps but we didn’t experience any loss of appetite and was eager to go outside (still some diarrhea though). He has been resting most of the day so far, thankfully no seizures.. but I promise I will not be giving him the other 2 doses I got from the vet after reading all of the experiences everyone else has had with their animals. Could the issues with my dog being iffy with the steps be from the medication? It’s hard to say since he has previously been diagnosed with lymes. I would absolutely rather be safe than sorry.. no more simparica trio for that guy.

I wish I would have researched this before giving it to my puppy who is only 10 weeks, he has the same symptoms . I only researched it after he started not feeling well, just trusted my vet that this was safe. I want to thank everyone who posted I could not find enough information on other sites.

I just gave my Matty her first dose. I’m now scared half to death. I wish I had seen this post first. I wouldn’t have given it to her.

I gave simparica trio to my 10-year-old Havanese. The next morning, she had uncontrollable tremors and could not walk without falling down. Today is day three and she is a little better, with fewer episodes of tremor and more often able to walk without falling. (On Monday, she fell down several times in an hour. Today she has fallen 2 or 3 times in the last 8 hours). I am trying to remain confident that my poor girl will recover. My vet seems skeptical that this is related to simparica but it seems clear to me, although I realize that anecdotal cases don't prove it. I'm not going to make her a test case by giving her another dose next month.

Gave my 3 month old, 3 pound shih tzu simparica on Sunday night. Tuesday morning she woke up with horrible diarrhea. Vet gave her a shot which stopped it. Wednesday morning at 5am she awoke with bloody diarrhea and it turned into just blood. Vet put her on metronidazole which is working. No way I will ever give it to her again. She had some itching and a bit lethargic but is eating very well. iI hope she will not have any other problems. I will use Sentinel and Pet Armor on her as this is what I have always gjven my dogs with no problems.

Just had my 1 yr old goldendoodle to the vet because he has had 3 seizures in the last month. His first was a week after taking his simparica. He had gone to a new groomer and when he came home he had a seizure. He is otherwise normal and healthy. I called the vet and they said it was likely brought on by stress. He was very anxious when I left him and picked him up. He has been getting groomed since he was 3 months old but we've noticed that he has been getting more anxious with time. He has been on simparica since he was old enough to take it. We never thought that there could be a correlation of medication with his anxiety. He is very friendly with other people and pets and never had an issue in that regard. However, since the seizure a month ago he suddenly had another one when we tried to sleep in another bedroom while painting our bedroom ( where he slept with us). The following morning he had another small seizure. His blood work came back normal but the vet called me to ask if his simparica somehow coincided with time of the seizures. As I said, the first was a week after taking it, then the 2nd and third seizure happened at day 29. Meaning he is suppose to get it today. The vet said not to give it. My pup is scheduled to see a neurologist Monday ( today's friday) to evaluate. I've read that simparica takes 35 days to get out of their system. Im wondering if after it is out of his system or have I now poisoned my baby where he might have a seizure disorder for the rest of his life. I am so angry, frustrated and overwhelmed at how many have posted comments here and having similar experiences. I'm also wondering if his anxiety is related as well. I pray for my baby to be ok and all of you who are in this battle. I hope there will be a class action lawsuit but most importantly that the word get out to stop this medication from harming another life.

My 5 year old Bichon Frises, Ivy, was on NextGard for years. I did not notice any side effects.
Last summer, I began giving her Trio. Sometime later she had trembling, leg spasms, and
pain. She was up all night crying and shaking. The next day, I took her to a veterinary hospital
and she had all sorts of tests-to know avail. Her back legs have continued to have spasms. I
did not know to connect her symptoms to Trio until I saw these entries. She has knee issues,
so I thought that was the cause. I hope stopping the medication will allow her to return to her
previous health. None of the veterinarians even asked about what flea meds I was giving her.
Upsetting.

My Jack Russell Terrier has taken Simparica Trio for several months. While she has not had seizures, trembling, or spasms, sometimes she just squeals and jumps up for no obvious reason. It sounds as if she's been pinched while sleeping although nothing visible happened. Could this be caused by the med?

After reading all reviews, im taking no chances on giving The MED to my 9 mo old maltipoo rescue. My 15 yr old doodle wasnt given bravecto because of reviews. How can you give a dog a pesticide to ingest. Glad i held off on the free sample i was given!

I wish I read these side effects before my vet recommended Simparica Trio for my 12 week old Bichon. She had the treatment yesterday and seemed ok. But today she isn’t eating well, had a bout of diarrhoea and is very tired. If she continues I will be going to the vet. I will not be continuing with this treatment. Why the vets use this treatment after so many side effects being reported is disgusting. I’m just hoping my sweet girl is going to be ok

My English Springer Spaniel(Sadie) received her first dose of Simparica Trio at 12 weeks old, with no noticeable side effects. Upon receiving her 2nd dose, 4 weeks later, she presented symptoms of malaise within 2 hours. By the following day, she was showing symptoms of marked neurological impairment, similar to a human having suffered a stroke. She had right sided weakness, with right sided neglect( the inability to process stimuli with impaired spatial recognition ). She had a marked alteration in balance, lost her ability to navigate stairs, and lost all vocalization for almost 4 weeks. She would constantly twirl in left circles. My vet reached out to Simparica Vet Rep, who, I was told, stated they were unaware of this neurological side-effect? She is now 2 1/2 months post event. Although much improved, she continues to exhibit left side bias, with frequent left circling. I am a physical therapist, and acquired Sadie to serve as a Therapy Dog in our clinic. As of today, Sadie's ability to eventually meet the strict certification requirements in that pursuit, remains guarded, although her progress prior to this event had been stellar. Thank all who have posted to bring this subject to light.

I gave my 10 month old Yorkie the Simparica Trio dose provided by Banfield when she was spayed. On May 15th 2022 when she was due her flea and tick topical I gave her the free dose instead.Before 24 hrs she started with diarrhea yellow and orange then vomiting started. Were now into day 2 no changes except add a continuous walking into the next room turn around come back sit down just to repeat several more times. This has gone on for about half of the day. Her poor top underside of her tail has raw skin the hair is completely gone like burnt off from diarrhea. I am so worried about her I called to explain and was told to feed her chicken and rice and if she isn't improved take her to Emergency Vet Hospital. I keep praying she will recover and I feel so guilty for giving it to her. If she comes out of this I will return to heartworm pills and topical flea and tick meds. I have every intention of calling and filing a complaint. If anyone has discovered what can help please let me know.

I gave this to my #3. 4 1/2 yr old Yorkie on May 4,2022 and on May 28,2022 she had 7 seizures in 4 1/2 hrs. Was hospitalized for 2 1/2 days. Today June 1,2022 she is still having neurological problems. I’m so angry at these drug companies and vets for selling this crap. I argued with the vet that this is poison and she said why would I give your dog poison? Yes I’d like to know that answer myself.

As I read all the comments I am so alarmed. Our vet pushed this new drug for this tick season claiming the drug we used previously they had 11 dogs in the previous year were diagnosed with Lyme disease and they no longer had confidence in that drug. We administered the first dose on Wednesday June 1st to our 9 year old bouvier flanders. The next day Bella’s stools were quite soft but still had some structure. Bella is very consistent and normally has two bowel movements but hubby noted an increase in bowel movements and their amounts. Friday early evening Bella’s stool was still soft with structure with the outside color almost black but the inside was tinged with lime green. Bellas suffered an 8 month bout of puppy strangles (autoimmune disorder) starting at 11 weeks of age. She nearly died. 8 months of prednisone and around the clock nursing care at home saved her life. So you can imagine my worry now. Bella is a very anxious dog and is my husband’s shadow. She seems more anxious now and really attached to hubby. She is still eating but she is drinking more water. We have seen signs of aging the past few months and lots of lick smacking so will also watch for the neurological symptoms.

Since reading this forum we will not continue with this drug. And pray we don’t see anymore symptoms such as seizures, tenors, lethargy, loss of appetite. My question for folks in the thread is - did you see a delay in symptoms in your dogs? Is it possible she will worsen?

Thank you posting your lived experiences. Education is key. And will save both dogs and heartaches in families. To the owners who lost your dogs - my heart goes out to you. I know your pain.

My 18 month old dog has had Sim Perica trio
for the last year. The rescue we got him from gave us a few months supply when we adopted him and he seemed fine on it. I gave him his monthly dose yesterday and a few hours later me had a siezure.
I’m sure it’s from that. Thank God he seems fine today. I will not be giving to him again!

My 9 month old puppy started acting very lethargic after taking simparica trio. He had it once before with no issues. This time he just kept collapsing, bloated appearing, vomit, and diarrhea, and hiding with his face down and nose in carpet. We took him to vet and they gave nausea meds and kept him overnight. They got him to eat a little the next morning and sent him home. By Tuesday evening symptoms came back worse. Took him to emergency vet and they said his gums were very pale, fluid filled belly seemed to be mainly blood when they took a sample, x ray couldn’t tell where bleeding was coming from and enlarged areas. He wouldn’t survive surgical attempt to go in and try to figure out what was going on. He had to be put to sleep and I’m devastated.

I gave this to my 2 rescue frenchies.. 2 days after 1 of them threw up..she didn't want to eat and started stumbling..leaning to the right, I thought vestibular but that is old dogs disease..I took her to the vet, did bloodwork that came back ok..she is on steroids and anti nausea meds..she is eating now..drinking alot and acts like she is deaf..she is only 6 yrs old. I know it's the simparica...really sucks, I should have never given this to my dogs

I have given Simparica to my Seven years old labrador male as per the advise of Vet on DTD.23/05/2022...after that he had taken no food and slept all time and little bit water....first of all I think it's happened to heat wave of climate but suddenly I guess it has the side effect of Simparica... thereafter I rushed to the Odisha University of Agriculture and Technology..after blood test...the vet. Doctor prescribed the salyien with some injunction but all are in vain..my labrador has same issues till date...my vet.not says anything about the side effect of the Simparica..i m now helpless..pls help me what should I do.. please help me to rid over it...pls pls ..guide me