Health & WellbeingSince getting my 16y.o. cat on the right dosage of methimazole he has COMPLETELY CHANGED, seems wiped out, doesn't rcome when I call, walks around like he's in a cloud, and stops mid-move like HE'S FORGOTTEN HIS INTENTION! Not sure if this is med-rel
Richochet is one handsome little guy! I'm sorry to hear that he's had so many behavioral changes since his methimazole dose has been regulated. The most common side effects from methimzaole include stomach upset (vomiting, diarrhea, appetite changes), lethargy, facial itchiness, as well as some liver issues and changes in blood cell counts. Behavioral changes aren't documented as known side effects of this medication (I just double checked!), although excess vocalization has been recognized as a side effect. While we keep in mind that not all cats "read the textbooks," it would be unexpected for all of these behavioral changes to occur due to methimazole alone. Given your recent move and Richochet's age, it does stand to reason that anxiety from these changes or cognitive dysfunction (essentially kitty dementia) could be to blame here.
I don't think it's necessarily wrong to give Prozac a try, but it's also important to note that it takes about 2 months for that medication to reach th
Updated on August 12th, 2025
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