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My cat is twitching after flea treatment. Should I be concerned?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed

I put flea treatment on my cat and she started twitching? Should I be concerned?

3 Answers

Most Helpful Answer

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on August 28th, 2016

Yes I would be concerned, as this can be a sign of flea treatment toxicity. I would put her into a bath immediately, and gently wash the treatment off with water water and Dawn dish soap. Continue to monitor her for signs of toxicity, including vomiting, diarrhea, muscle tremors, hyper salivation, and depression. If you see any of those signs, take her into your vet immediately. I would make sure that the flea treatment you put on Annie was for cats and not for dogs, as it's very important to have a cat dose for cats because they are so sensitive to the flea medication. I would wait a few days before reapplying a flea treatment, and I would use a different brand than what you just used. I recommend using Advantage or Revolution.

4Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By Lauren M. Jones, VMD
Veterinarian
Published on August 3rd, 2017
Oh no! Twitching is not a normal reaction to any flea medication, but it is possible that Rosie is itchy and bothered by her fleas. At this point, I would recommend giving her a bath in original blue Dawn dish soap to try to remove any remaining flea prevention in case this is the problem since reactions to medication can be fairly severe. You can give Rosie an oral Capstar tablet ( http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=10902 ) which will kill adult fleas within 30 minutes, but will not provide any lasting protection. I would avoid applying another topical preventative for at least 2 weeks in case some of the initial medication remains in her system. Instead, you can ask the vet about a prescription-based oral flea preventative, such as Comfortis ( http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=18887 ), which can be given right away. If Rosie continues to twitch after the bath, she should go to the vet for further evaluation. I hope this helps and that all goes well!
1Pet Parents found this answer helpful
Answered By Kevin Sanada, DVM
Veterinarian
Published on May 27th, 2018
It may be irritating her, as the liquid is somewhat oily and may have a small sensation while it's getting absorbed. Cats are well-known to be meticulous groomers and will be irritated by this, because they cannot lick the area where the medicine was applied.

If it's just some twitching of the skin, then I would not be too concerned and would expect her to stop this within a day or two. If she had twitching in other parts of the body, or seizure activity, then I'd be concerned that she is having a reaction to the medication. If this is the case, or the twitching persists for longer than two days, then it's best to have your vet evaluate Minnie.

I hope that helps and all is well with Minnie.
1Pet Parents found this answer helpful

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My cat is trembling after Hartz flea gel. Is it a side effect?

Poor girl. I suspect she is having a mild reaction to the Hartz flea medication. Unfortunately, this particular flea prevention has been shown to have adverse effects in many cats that cause neurological issues stemming anywhere from muscle twitching to full on seizures. I would recommend rinsing the product off as best you can using Dawn dish detergent, followed by a soothing cat friendly conditioner from your local pet store to rehydrate the skin. And then a vet visit is best to get her fully evaluated to make sure she doesn't require any additional treatment (i..e muscle relaxer) or antihistamines. I hope that your fur baby Lucy is able to make a full and speedy recovery and its best to get her on a higher quality flea prevention (i.e Revolution, Cheristin, Advantage is ok) next time to limit adverse reactions in the future. Best wishes and take care.

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Why is my cat acting strange after Advantage flea treatment?

I wouldn't have a concern about Advantage for felines, especially if Cheeto has had it before. Sometimes the feeling of the medication on their skin can feel weird, and we apply it in an area so that they can't easily groom it off, which could cause some anxiety. Keep an eye on Cheeto and if he isn't back to normal in a day or two, have him examined by your vet.

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Why is my cat twitching, licking, and restless after being outside?

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