The half-life of propylthiouracil tablets is two hours, it is easily absorbed after oral administration and distributed throughout the body, it can reach the thyroid gland in 20-30 minutes after taking the medicine, 60% of it is metabolized in the liver, and it can be excreted through the placenta and breast milk. Propylthiouracil tablets are mainly used in the following situations: first, all types of hyperthyroidism, especially for patients with mild condition and mild to moderate enlargement of the thyroid gland, it can be used for adolescents and children, elderly patients. Second, it can be used for patients with recurrence after thyroid surgery and not suitable for radioactive iodine treatment. Third, it can be used for the preparation before surgery. The common side effects of propylthiouracil tablets are prone to headache, dizziness, arthralgia, swelling of salivary glands and lymph nodes, and gastrointestinal reactions, the most serious adverse reaction is granulocyte deficiency, so the blood should be checked regularly during the period of medication.