Antithyroid Agents

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Antithyroid Agents (Systemic)

Description and Brand Names | Before Using | Proper Use | Precautions | Side Effects

Description

Methimazole and propylthiouracil are used to treat conditions in which the thyroid gland produces too much thyroid hormone.

These medicines work by making it harder for the body to use iodine to make thyroid hormone. They do not block the effects of thyroid hormone that was made by the body before their use was begun.

Methimazole and propylthiouracil are available only with your doctor's prescription, in the following dosage forms:

Oral

Methimazole
- Tablets (U.S. and Canada)
Propylthiouracil
- Tablets (U.S. and Canada)

Brand Names

Some commonly used brand names are:

In the U.S. -

Tapazole ¹

In Canada -

Propyl-Thyracil ²
Tapazole ¹

Another commonly used name for methimazole is thiamazole .

Note:

For quick reference, the following antithyroid agents are numbered to match the corresponding brand names.

This information applies to the following medicines:
1.	Methimazole (meth-IM-a-zole)
2.	Propylthiouracil (proe-pill-thye-oh-YOOR-a-sill)‡
‡ Generic name product may be available in the U.S.

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		Antithyroid Agents: Before Using

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Antithyroid Agents (Systemic)

Category

Description

Brand Names