Why is my old cat drooling after starting hyperthyroidism meds?

Question

My cat is 18 & recently diagnosed with hyperthyroidism, plus has arthritis in hip/legs. Just started giving Methimazole gel medication in her ear 2x a day. After 1-month now, she's still severely underweight, but eating more now. We also give Advantage II to keep off fleas as she's outdoors a lot (kitten strength, since she's just under 5-lbs.). Not sure what is now causing her to drool often. Is that bad? And could it be one or both of the medicines (Methimazole & Advantage II)? Please help! Pet's info: Cat | Russian Blue | Female | spayed | 18 years and 2 months old | 4.5 lbs

David Elbeze, DVM, MRCVS · Accepted Answer

It's not likely to be any of those meds that is causing the drooling, the two main options are kidney failure (common in old cats and in cats with hyperthyroidism) or a gum/teeth disease. i would recommend taking Sekani to the vet in order to get it checked, i recommend repeating a blood test to also check the kidney function.

Why is my old cat drooling after starting hyperthyroidism meds?

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