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Methimazole is a custom pharmacy drug with a pharmacologic classification of thyroid hormone antagonist. Methimazole's primary objective is to combat overactive thyroid known as hyperthyroidism. Methimazole works by curtailing the thyroid gland's ability to manufacture hormones. This drug is sometimes given before certain types of thyroid surgeries, as well as radioactive iodine therapy.


Methimazole is often administered via tablets. Tablets are mostly prescribed at a dosage of approximately three times per day but your doctor will decide what is right for you. Tablets are generally taken with food. Consult with your compounding pharmacist if you have general questions during your course of methimazole. Consult with your doctor if you have questions pertaining to side effects or dosage, etc. Always follow your doctor's directions precisely regarding dosage and usage. Never take more than your doctor prescribes.


All drugs carry the risk of side effects as your body adjusts, and then even sometimes ongoing. It is important to note that any side effect can become serious so no side effect should be ignored. Contact your doctor if you experience any side effect that seems to be getting worse or persisting. Some of the most commonly experienced side effects are as follows:

  • Upset Stomach and/or Discomfort
  • Vomiting
  • Loss of Taste
  • Swelling
  • Muscle Pain
  • Joint Pain
  • Dizziness
  • Drowsiness
  • Skin Rash and/or Itching
  • Hair Loss
  • Decreased Platelets
  • Decreased White Blood Cells
  • Abnormal Sensations (prickling or tingling feeling / burning, tightness)

Severe Side Effects:

Some patients taking this drug may possibly encounter more severe side effects. If you encounter anything that feels severe, or anything listed below, see your doctor right away or get medical attention at once.

  • Skin Eruptions
  • Jaundice
  • Chills
  • Sore and/or Aching Throat
  • Fever
  • Headache
  • Right-Sided Abdominal Pain (with low or no appetite)
  • Abnormal Bruising
  • Unusual Bleeding


Do not take this drug unless you have consulted with your doctor and he or she has decided it is safe for your use and necessary for your treatment.

There are many possible contraindications for methimazole. Ask your doctor if you have any condition, disease, or are taking any drug that would contraindicate the use of methimazole in your case.

CAUTION: Anyone with a blood disorder or liver disease should not use methimazole unless their primary care doctor has cleared them to take it.

Methimazole may be contraindicated for pregnancy and breastfeeding. Do not use if either applies to you unless you have consulted with your primary care doctor and he or she has deemed the use of methimazole to be absolutely necessary for your treatment.

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    Clair C. | West Hollywood, CA