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If your thyroid levels are higher than they should be, your healthcare provider may recommend Tapazole, an antithyroid medication. This medicine comes in the form of a tablet and is available in two strengths. It is typically taken three times a day. Although most people tolerate the drug well, side effects (such as hair loss, headache, and muscle pain) may occur.

What Is Tapazole?

Tapazole® (methimazole) is a prescription antithyroid medication used to treat an overactive thyroid (known medically as hyperthyroidism).
(Click Tapazole Uses for more information, including possible off-label uses.)

Who Makes Tapazole?

Brand-name Tapazole tablets are made by AAI Pharma for King Pharmaceuticals, Inc. Generic versions are made by various manufacturers.

How Does It Work?

Tapazole works by inhibiting the production of hormones in the thyroid. The medication prevents the oxidation of iodine, an important step in the production of thyroid hormones. It does not affect the thyroid hormones that are already circulating in the bloodstream.

When and How to Take This Medication

Some general considerations to keep in mind while taking this medication include the following:
  • Tapazole comes in tablet form. It is usually taken three times daily.
  • You can take it with or without food.
  • For the medication to work properly, it must be taken as prescribed.

Dosing Information

The dose of Tapazole your healthcare provider recommends will vary, depending on a number of factors, including:
  • How you respond to this medication
  • The severity of your condition
  • Your weight (for children)
  • Any other medical conditions you may have.
As is always the case, do not adjust your dose unless your healthcare provider specifically tells you to do so.
(Click Tapazole Dosage for more information.)
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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