Propylthiouracil is a medication used to treat hyperthyroidism, a condition where the thyroid gland produces too much thyroid hormone. It works by inhibiting the production of these hormones, helping to restore normal levels in the body. This can alleviate symptoms such as rapid heartbeat, weight loss, and anxiety. The drug is often prescribed for conditions like Graves' disease and is typically taken in pill form. While effective, it may have side effects, including liver issues and allergic reactions. Regular monitoring by a healthcare provider is essential to ensure safe and effective treatment.