Which anti-thyroid drug is Propylthiouracil?

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Multiple Choice

Which anti-thyroid drug is Propylthiouracil?

Explanation:
Propylthiouracil is an antithyroid drug in the thionamide family. It works by inhibiting thyroid peroxidase, which blocks the synthesis of thyroid hormones T3 and T4. It also decreases the conversion of T4 to the more active T3 in peripheral tissues, helping to lower active hormone levels quickly. This direct suppression of hormone production is what makes it an anti-thyroid medication. In contrast, iodine solutions primarily acutely block hormone release, and radioactive iodine destroys thyroid tissue rather than just suppressing synthesis. Methimazole is a related thionamide with a similar mechanism. PTU is often preferred in early pregnancy due to teratogenic concerns with methimazole, but it carries a risk of liver injury, so its use is carefully managed.

Propylthiouracil is an antithyroid drug in the thionamide family. It works by inhibiting thyroid peroxidase, which blocks the synthesis of thyroid hormones T3 and T4. It also decreases the conversion of T4 to the more active T3 in peripheral tissues, helping to lower active hormone levels quickly. This direct suppression of hormone production is what makes it an anti-thyroid medication. In contrast, iodine solutions primarily acutely block hormone release, and radioactive iodine destroys thyroid tissue rather than just suppressing synthesis. Methimazole is a related thionamide with a similar mechanism. PTU is often preferred in early pregnancy due to teratogenic concerns with methimazole, but it carries a risk of liver injury, so its use is carefully managed.

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