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My old cat is lethargic. Is it arthritis from the rain? Can I give Onsior?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 18 years and 1 month old | 8 lbs

Jack seems a little more lethargic lately, and while I know he’s bound to be getting slower due to age, how would I know if something was going on? He’s eating and drinking fine, no bathroom issues that I can tell, and he takes half of a 5mg of Methimazole a day for his thyroid. We’ve had a lot of rain lately, and I wondered if that could be aggravating any arthritis he may have? And if so, could I give him a 6mg Onsior?

1 Answer

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on May 28th, 2018

It is very likely that he feels the weather in his bones and cats do suffer from arthritis. If the Onsior was prescribed for him by your vet, you can give it to him. If not, I would definitely wait until tomorrow and call your vet and ask whether you can give it to him. We are not allowed by law to authorize or prescribe medication.

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