Medications and Drugs
Brand Names: Northyx, Tapazole
Generic Name: methimazole (Pronunciation: me THIM a zole)
What is methimazole (Northyx, Tapazole)?
Methimazole is used to treat hyperthyroidism (overactive thyroid). It is also used before thyroid surgery or radioactive iodine treatment.
Methimazole may also be used for other purposes not listed in this medication guide.
Methimazole 10 mg-EON
round, white, imprinted with E 210
Methimazole 10 mg-MUT
round, white, imprinted with XM
Methimazole 5 mg-EON
round, white, imprinted with E 205
Methimazole 5 mg-MUT
round, white, imprinted with VM
Methimazole 5 mg-PAR
round, white, imprinted with MP 751
Tapazole 10 mg
round, white, imprinted with J95
Tapazole 5 mg
round, white, imprinted with J94
What are the possible side effects of methimazole (Northyx, Tapazole)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using methimazole and call your doctor at once if you have a serious side effect such as:
Less serious side effects may include:
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is the most important information I should know about methimazole (Northyx, Tapazole)?
Methimazole can increase your risk of bleeding. If you need to have surgery, tell the surgeon ahead of time that you are using this medication.
Methimazole can lower blood cells that help your body fight infections. This can make it easier for you to bleed from an injury or get sick from being around others who are ill. Your blood may need to be tested often. Visit your doctor regularly.
Do not receive a "live" vaccine while you are being treated with methimazole, and avoid coming into contact with anyone who has recently received a live vaccine. There is a chance that the virus could be passed on to you.
Keep using this medication even if you feel fine or have no symptoms of hyperthyroidism. You may need to keep taking methimazole long term to control your condition. Stopping the medication could cause your symptoms to return.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
Need help identifying pills and medications?
Find out what women really need.