Cat lethargic, not eating on Felimazole. Is the dose too high?

Question

My 11 y/o male cat is taking 12.5 mg of Felimazole a day and now is lethargic, no appetite, but drinks water... Too high of dose possibly?? He seemed fine until a few days ago.. Pet's info: Cat | Mixed Breed | Male | neutered | 9 years and 8 months old | 6 lbs

Jessica Keay, DVM · Accepted Answer

I am sorry to hear about Midnite. I would call and let your vet know of the symptoms. You don't mention if he just started this medication or if he has been on it long term. Some cats can experience lethargy and GI upset when first starting the medication and in some cases we need to start at a lower dose and taper it up, but you need to consult with your vet in order to know if this is the right course of action for your kitty. If he has been on methimazole for a long time and just started with the lethargy/decreased appetite, then an exam and possibly bloodwork are in order for him to ensure there isn't another cause for his symptoms.

Cat lethargic, not eating on Felimazole. Is the dose too high?

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