Methimazole prevents the thyroid gland from producing too much thyroid hormone. Methimazole is used to treat hyperthyroidism (overactive thyroid). It is also used before thyroid surgery or radioactive iodine treatment. Methimazole may also be used for other purposes not listed in this medication guide.
Tapazole is a medicine that is used in the prevention of the thyroid gland from being able to produce excess thyroid hormone. Tapazole is used to treat hyperthyroidism, this is an overactive thyroid. It can also be used before surgery of the thyroid of treatment of radioactive iodine.