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Ask Dr. Michael Salkin Your Own Question
Dr. Michael Salkin
Dr. Michael Salkin, Veterinarian
Category: Cat Veterinary
Satisfied Customers: 26928
Experience:  University of California at Davis graduate veterinarian with 44 years of experience.
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My 13 year old male cat has hyperthyroid. My vet put m on

Customer Question

My 13 year old male cat has hyperthyroid. My vet put him on 5mg of Methimazole a day. It knocked him on his butt. After reading, I put him on 1/2 of that 2.50/2.50. He was much better dealing with that. Now,,,,,,he seems to be back to acting like a rock :-I Am I off base with cutting back on his dose ?
Submitted: 1 year ago.
Category: Cat Veterinary
Expert:  Dr. Michael Salkin replied 1 year ago.

Most cats are successfully managed at 2.5 mg twice daily. If your cat is acting poorly once again his vet needs to know this and a hyperthyroid recheck panel (T4 (total thyroid blood test), BUN, creatinine (kidney tests) at least) needs to be performed. My primary concern is that his hyperthyroidism has been overtreated and this results in uncovering the true - often impaired - kidney function these cats deal with at 13 years of age. Minor hyperthyroidism has a reno-protective (kidney protective) effect. Once the hyperthyroidism is well-controlled, however, renal insufficiency often is uncovered and can cause your cat's malaise. The blood tests should be performed at your earliest convenience prior to stopping methimazole administration. Once the blood is drawn, stopping that drug is prudent if only because he may not be tolerating it well even if his kidneys are OK.

Please respond with further questions or concerns if you wish.