Methimazole tablets belong to the anti-thyroid drugs, the main effect is to reduce the thyroid synthesis and secretion of thyroid hormone, can be used for the treatment of many types of hyperthyroidism, can also be used for hyperthyroidism preoperative preparations and radioactive iodine treatment adjuvant therapy. Methimazole can inhibit the peroxidase enzyme in the thyroid gland, thus hindering the synthesis of thyroxine (T4) and triiodothyronine (T3), which can be used for the treatment of many types of hyperthyroidism, and can also be used for the preparation of preoperative hyperthyroidism and the adjuvant treatment of radioactive iodine therapy. Allergic skin reactions such as itching and rash are common with methimazole tablets, and adverse reactions such as arthralgia, granulocyte deficiency, bone marrow suppression, and taste disturbances are also seen. It should be used with caution in pregnant women, those with abnormal liver function, and those with granulocytopenia. It is contraindicated in persons who are hypersensitive to methimazole or any of the ingredients in this product. After treatment with propylthiouracil or methimazole, those who develop severe myelosuppression or granulocyte deficiency should stop the drug immediately. The use of methimazole tablets should be supervised by a medical professional.