What is the most important information I should know about methimazole?
Do not take methimazole if you are
breast-feeding a baby.
Do not use this medication without telling your doctor if you are
pregnant. It could
cause harm to the unborn baby. Use an effective form of
birth control, and tell your doctor if you
become pregnant during treatment.
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 the blood cells that help your body fight infections. This can
make it easier for you to get sick from being around others who are ill. To be sure your blood
cells do not get too low, your blood will need to be tested on a regular basis. Do not miss any
scheduled visits to your doctor.
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.
What is methimazole?
Methimazole prevents the thyroid gland from producing too much thyroid hormone.
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 purposes other than those listed in this medication
guide.
What should I discuss with my healthcare provider before taking methimazole?
Do not use this medication if you are allergic to methimazole.
Before taking methimazole, tell your doctor if you are allergic to any drugs, or if you
have:
If you have any of these conditions, you may not be able to use
methimazole, or you may need dosage adjustments or special tests during treatment.
FDA pregnancy category D. This medication can cause harm to an unborn baby.
Do not use methimazole without your doctor's consent if you are pregnant.
Tell your doctor if you become pregnant during treatment. Use an effective form of birth control
while you are using this medication.
Methimazole can pass into breast milk and may harm a nursing baby. Do
not use methimazole if you are breast-feeding a baby.
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