When your cat has an overactive thyroid (hyperthyroidism), his or her thyroid gland produces too many hormones. This overproduction of hormones causes weight loss, increased appetite, excessive thirst, hair loss, and more. Felimazole is a tablet prescribed for the treatment of hyperthyroidism in cats. Felimazole doesn’t cure hyperthyroidism but improves your cat’s quality of life by reducing the production of thyroid hormones. Your cat doesn't need to go through the stress of surgery or anesthesia to treat hyperthyroidism, just use Felimazole!