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Updated on September 23rd, 2025
Pet's info: Cat | Mixed Breed | Female | spayed | 9 lbs
My cat has been prescribed 2.5 mg of Felimazole twice daily for hyperthyroidism. How long does the Felimazole stay active in the cat’s bloodstream? The reason for the question is that when I need to be away from, I have a cat sitter that comes in once a day to tend to the cat. Should she double the dose (5 mg), or stay with a single 2.5 mg pill?
1 Answer

Answered By Linda G, MS, DVM
Veterinarian
Published on May 3rd, 2018