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My cat is lethargic and quiet after deworming. Should I worry?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | 3 lbs

I rescued a little street cat. Hes friendly,I wormed him as he was vomiting worms. This is cleared now but fir 2 days hes been quiet and sleepy.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on January 9th, 2017

A side effect of the deworming treatment can be lethargy, which would be due to the vomiting and the movement of dead worms through Leo's intestinal system. This should pass in another 24 hours, but if it doesn't, I would have him seen by a vet for a heath check.

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