Methimazole is used for:
Treating an overactive thyroid gland and treating or preparing the overactive thyroid gland for surgery. Methimazole may also be used when your doctor has advised against the removal of the thyroid. Methimazole may also be for other conditions as determined by your doctor.
Methimazole is an antithyroid agent. It works by inhibiting the production of thyroid hormone. Thyroid hormones are produced and released by the thyroid gland and regulate the body's metabolism.
Do NOT use Methimazole if:
- you are allergic to any ingredient in Methimazole
- you are breast-feeding
Before using Methimazole :
Some medical conditions may interact with Methimazole . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
- if you are pregnant, planning to become pregnant, or are breast-feeding
- if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
- if you have allergies to medicines, foods, or other substances
- if you have bone marrow or liver problems
- if you have exfoliative dermatitis (widespread redness and scaling of the skin)
Some MEDICINES MAY INTERACT with Methimazole . Tell your health care provider if you are taking any other medicines, especially any of the following:
- Anticoagulants (eg, warfarin), beta-blockers (eg, propranolol), digitalis glycosides (eg, digoxin), or theophylline because the risk of their side effects may be increased by Methimazole
- Anticoagulants (eg, warfarin), corticosteroids (eg, hydrocortisone), or digitalis glycosides (eg, digoxin) because their effectiveness may be decreased by Methimazole
How to use Methimazole :
Use Methimazole as directed by your doctor. Check the label on Methimazole for exact dosing instructions.
- Take Methimazole by mouth with or without food. If stomach upset occurs, take with food to reduce stomach irritation.
- Take Methimazole on a regular schedule around the clock, unless your doctor tells you otherwise.
- If you miss a dose of Methimazole , take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.
Important safety information:
- Methimazole may cause drowsiness, dizziness, or lightheadedness. These effects may be worse if you take Methimazole with alcohol or certain medicines. Use Methimazole with caution. Do not drive or perform other possibly unsafe tasks until you know how you react to Methimazole.
- Lab tests, including thyroid and liver function tests, complete blood cell counts, and blood clotting tests (eg, PT, INR), may be performed while you use Methimazole . These tests may be used to monitor your condition or check for side effects. Be sure to keep all doctor and lab appointments.
- PREGNANCY and BREAST-FEEDING: Methimazole has been shown to cause harm to the fetus. If you think you may be pregnant, contact your doctor. You will need to discuss the benefits and risks of using Methimazole while you are pregnant. Methimazole is found in breast milk. Do not breast-feed while taking Methimazole .
Possible side effects of Methimazole :
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Change in taste; dizziness; drowsiness; headache; joint pain; lightheadedness; muscle pain; nausea; numbness and tingling; stomach upset; vomiting.
Seek medical attention right away if any of these SEVERE side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); changes in appetite; dark urine; fainting; fast or irregular heartbeat; fever, chills, or persistent sore throat; severe or persistent headache, nausea, or vomiting; stomach pain; tremor; unusual bruising or bleeding; unusual hair loss; unusual tiredness or weakness; vision changes; yellowing of the skin or eyes.