My cat threw up after Sentry flea treatment. Is it dangerous?
Updated On September 23rd, 2025
Pet's info: Cat | Siamese | Male | neutered
Good evening, my wife and I applied Sentry PurrScriptions flea and tick medicine to our three cats, within minutes two of them had thrown up. We didn't see them lick themselves but it's quite possible they could have. After googling it I was scared by countless horror stories caused by Sentry. The cats are acting normally, but I just wanted to double check.
3 Answers
Most Helpful Answer
Published on December 29th, 2017
Yes, Sentry products are not recommended. If you need flea prevention you should get it from your vet. My recommendation would be to try and wash off that medication ASAP. Use Dawn dishsoap to wash the cats since it will cut through the oils in the skin. Be sure to rinse them thoroughly and dry them with towels (not hair dryers). If they start showing any other symptoms, especially neurologic symptoms, they need to get to a vet as an emergency. Hope this helps. Sorry this happened. Best wishes.
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on July 19th, 2018
Hello, thank you for using PetCoach. He is probably having a reaction to the Sentry. This is not the best product and I strongly recommend you stay away from using it. This product is known to have a high rate of reactions. If you are looking for an over the counter product I would use [Advantage II](https://www.petco.com/shop/en/petcostore/product/advantage-ii-once-a-month-cat-and-kitten-topical-flea-treatment-over-9-lbs) but honestly, when a cat has other underlying health issues it is best to consult with your vet as to what the best product would be to use for him. At this point in time, the best thing to do is to bathe him in Dawn dish soap in an attempt to remove any residue from the Sentry and then wait two weeks before applying a different product. Hope this helps. Best wishes.
1Pet Parents found this answer helpful
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Published on March 27th, 2020
Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about Samantha. Sentry is actually a pretty good product, it's one that I recommend, and I would not worry about reviews online. That is anecdotal evidence not scientific evidence. She should be ok. I hope this helps!
1Pet Parents found this answer helpful
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