My cat has diarrhea after Revolution. Is it parasite die-off?

Question

Like certain dewormers used with horses, can Revolution cause a parasite 'toxicity'' in cats? Have a stray/rescue with severe ear mites, so gave the 1st dose of Revolution. Since then, he has developed severe diarrhea for 3 days. He's eating and drinking. Prior to the Revolution, he vomited at least once a day. I'm wondering if this could be shedding a parasite burden, or the toxic result of the parasites being killed off, or perhaps even Coccidiosis? He is away from my other cats, but goes out. Pet's info: Cat | Domestic Longhair | Male | unneutered

Jessica Desrosiers · Accepted Answer

A heavy parasite load can cause some GI upset such as diarrhea as the worms die off and are expelled from the body. In some cases, multiple dewormings are needed to clear them all. However, if you suspect there is something else going on, such as an allergic reaction to the medication, the worms, or another underlying illness, it would be best to seek veterinary care ASAP for further examination and workup.

My cat has diarrhea after Revolution. Is it parasite die-off?

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