- Jun 4, 2005
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He has been on methimazole (gel) for about 3 months now and his T4 levels are back down to a normal range BUT the diarrhea is still bad. The vet says that something else could be causing it or it could be a side effect of the methimazole but it is not listed as one. I have read that hyperthyroid can cause damage to the gastro system. Does anyone else have a cat with this problem? I know it is common in older cats, Louie is about 14 or 15. I would sure appreciate hearing from you and what your experience has been. I am going to try to switch him over to tapamazole (sp?) pills to see if maybe the diarrhea will go away and also because the methimazole is so expensive! Thanks