Propylthiouracil prevents the thyroid gland from producing too much thyroid hormone. Propylthiouracil is used to treat hyperthyroidism (overactive thyroid) or Graves' disease. Propylthiouracil may also be used for other purposes not listed in this medication guide.
Propylthiouracil is a prescription drug for hyperthyroidism or Grave's disease with hyperthyroidism. Hyperthyroidism occurs when there is too much of the thyroid hormone produced by the thyroid gland, causing an excessively fast metabolism and other symptoms in patients 6 years old or older. Propylthiouracil prevents the thyroid gland from producing the thyroid hormone.