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I have a 16-year-old male Birman cat that has moderate hyperthyroidism, for which I give him one 5 mg tablet of Tapazole per day. He usually has a good appetite, but he does not gain weight. (He only weighs about 8.5 lbs.) How often should I take him t...

I would recommend taking your 16-year-old cat in for an exam either once or twice a year. Be sure to have his thyroid levels tested. Because he is not gaining weight, I would be suspicious that his thyroid hormone level is still too high and he may need his Tapazole dosage increased. The only way to determine how much Tapazole to give him is by running a blood test to see where his thyroid hormone level is. This should be done yearly, because it can change suddenly without warning any time the cat is not doing well (and that includes not gaining weight).

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