NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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What is a drug-induced cause of hyperthyroidism?

Lithium
Carbamazepine
Iodine
Metformin

The correct answer is: Iodine

Iodine is a drug-induced cause of hyperthyroidism because excessive iodine intake can lead to thyroid hormone excess. This can occur in individuals who consume large amounts of iodine-containing substances such as certain medications or supplements. The other options are not typically associated with drug-induced hyperthyroidism: - Lithium is more commonly known for causing hypothyroidism rather than hyperthyroidism. - Carbamazepine is an anticonvulsant medication and is not a common cause of hyperthyroidism. - Metformin is a medication used in the management of type 2 diabetes and is not linked to drug-induced hyperthyroidism. Therefore, the correct answer is iodine as it is a known drug-induced cause of hyperthyroidism.