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My cat threw up after deworming medicine. Is this normal? What to do?

Updated On September 23rd, 2025

My cat vomited after giving deworming medicine. What should I do?

4 Answers

Most Helpful Answer

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Answered By Janie von Waldburg, DVM

Veterinarian

Published on May 17th, 2015

This is common. It may taste bad or you may have forced him to take it. Most likely you could give him another dose with some food but consult your vet first. I am more concerned about what type of worms he has and if you have had a fecal test performed.

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11Pet Parents found this answer helpful

Other Answers

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    Answered By Dr. Leigh, DVM

    Veterinarian

    Published on October 13th, 2017

    Sometimes worms will be visible after deworming. If the vomiting continues and/or you keep seeing them then you should have him examined by a vet for treatment. It would also be a good idea to have a stool sample tested in a few weeks to make sure he doesn't have any remaining parasites.

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    Answered By Jennifer Summerfield, DVM CPDT-KA

    Veterinarian, Certified Dog Trainer

    Published on July 1st, 2017

    Vomiting can sometimes be seen as a side effect of many dewormers - as long as she's acting normal otherwise and she only threw up once, it's not likely to be a serious problem. And yes, if she didn't vomit until 2-3 hours after the medication was given, it's likely that it had already been absorbed. If you want to make sure, you can take a stool sample to your vet in a week or two and have it checked for parasites.

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    Answered By Destini R. Holloway, DVM

    Veterinarian

    Published on December 22nd, 2017

    After 1-2 hrs most of that medication was absorbed, even though you say some of it in the vomitus. I would not repeat the dosage because it appears that Mikaela may be sensitive to the medication. I would suggest using a different brand of dewormer the next go round, such as Pyrantel Palmoate or Fenbendazole and also make sure you are following the package for the correct dosage amount. You should give the next dosage in 3 days and then again in 2 weeks. Best of luck to you and Mikaela moving forward. Take care.

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