Why is my cat so tired and sleeping a lot after flea medicine?

Question

The vet gave my cat comfortis for fleas. The fleas have died and i removed them. But my cat has been sleeping/laying the whole day. He didnt vomit and has eaten and drank water. Is his sleepliness and lack of movement normal? Pet's info: Cat | Ragdoll | Male | neutered | 1 year and 9 months old

Jeffrey Milner · Accepted Answer

Depending on the extent of flea infestation, lethargy is not at all uncommon. Flea bites can drain a significant amount of blood and nutrients from the body, so when a severe attack as occurred, what you are describing is very much expected. If the exposure was not significant, it is possible that Milo may just be having a reaction to the medication itself. If this is the case, he should come out of it relatively soon. If not, I would have him reassessed by your veterinarian that prescribed the drug. Hope this helps.

Why is my cat so tired and sleeping a lot after flea medicine?

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