Dear Christopher Cat
Silk, our active, playful 9-year-old cat, has been losing weight, despite her voracious appetite. Her veterinarian diagnosed hyperthyroidism and prescribed Tapazole 2.5 mg once daily. Nevertheless, Silk continues to lose weight. What shall we do?
Now that Silk has been taking Tapazole for a while, it’s time to ask your veterinarian to recheck her weight and the level of thyroid hormone in her blood.
Cats with hyperthyroidism produce excessive thyroid hormone, which kicks the body’s metabolism into overdrive.
The increased metabolism causes weight loss and sometimes diarrhea and vomiting.
Tapazole, known generically as methimazole, suppresses the overactive thyroid gland, normalizing production of thyroid hormone.
However, the dosage usually must be adjusted throughout therapy, based on the cat’s weight, thyroid hormone level in the blood, kidney function and other considerations.
So it’s essential to have your veterinarian examine Silk and perform lab work periodically.
If, after dosage adjustments are made, you are unhappy with Tapazole therapy, you can consider other treatment options, including radioactive iodine to shrink the enlarged thyroid gland or surgical removal of the gland.
My brother had hyperthyroidism, and with Tapazole and regular monitoring, he lived a long, happy life.