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Methimazole
Pronounced meth-IM-ah-zole
Brand names: Tapazole
Type: Antithyroid medicine · All Hormone & Endocrine Medicines
What Methimazole is used for
- Overactive thyroid (hyperthyroidism)
- Graves disease
- Preparing the thyroid for surgery or radioactive iodine
Common side effects
- Rash
- Itching
- Nausea
- Joint pain
- Hair loss
Important cautions
- Rarely, it can sharply lower white blood cells — fever, sore throat, or mouth sores need urgent medical review
- Can injure the liver in rare cases
- Can harm an unborn baby early in pregnancy — pregnancy plans should be discussed with the care team
How it comes
Tablets. This guide lists forms only — it never lists strengths or doses.
Toxicity lists: Methimazole also appears on Medicines That Can Harm the Liver.
Related medicines — Hormone & Endocrine Medicines
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.