Petco Text Logo
Petco Pet Logo
  • Two Easy Ways to Start Earning Rewards!

    rewards header
    Become a member today!
    Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
    Petco Pay LogoBecome a credit card member today!

    Earn 2X Pals Rewards points at Petco
    when you use Petco Pay!

    APPLY NOW
    Learn More About Petco Pay Benefits

My cat has hyperthyroidism & pancreatitis. Should I stop methimazole?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 10 lbs

I have a 12 that was diagnosed with the hyperthyroidism a month ago tha he seemed better for about two weeks and then he started throwing up again & not wanting to eat so I went back to the vet and he now has pancreatitis too! The doctor said I should change his food and I bought some of the other food but he won't eat it so I gave him the other food he ste very little & he is very lethargic, pupils are dilated should I stop giving him the methimazole? He is usually very playful

1 Answer

Most Helpful Answer

Dr. Davis

Answered By Dr. Davis

Veterinarian

Published on October 1st, 2017

Yes I would stop the methimazole until you can have him checked again by your veterinarian. If he feels better off the methimazole then the methimazole dose may have been too high. They will check his blood work again for the thyroid level and for the pancreatitis. When changing diets I try adding just a small amount of new food at each meal until he gets used to it. Cats are fussy eaters but if he's still not eating it may be that Jojo just doesn't feel well and it wasn't that he didn't like the food. Once cats get regulated on the thyroid medication usually things smooth out and you'll have less problems. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Jojo.
Vote Icon1Pet Parents found this answer helpful

Smart Picks for Smart Questions

Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Share

Styled arrow button