NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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What drug is switched to after the first trimester in the treatment of hyperthyroidism during pregnancy?

Levothyroxine
Methimazole
Carbamazepine
Iodine

The correct answer is: Methimazole

After the first trimester, Methimazole is the preferred drug for treating hyperthyroidism during pregnancy. The other options, Levothyroxine, Carbamazepine, and Iodine, are not used for the treatment of hyperthyroidism during pregnancy, as they can have negative effects on both the mother and the developing fetus. Levothyroxine is a thyroid hormone replacement drug and is not used to treat hyperthyroidism, which is an overactive thyroid. Carbamazepine is an anti-seizure medication and is not used to treat hyperthyroidism. Iodine, while used in the treatment of hyperthyroidism, is not recommended during pregnancy due to the risk of causing hypothyroidism in the developing fetus. Therefore, Methimazole is the correct answer for treating hyperthyroidism during pregnancy after the first trimester.