What is the mechanism of action of methimazole in hyperthyroidism?

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Study for the NCLEX with quiz on the Endocrine System. Engage with multiple choice questions, detailed explanations, and tips for success. Prepare for your NCLEX exam!

Multiple Choice

What is the mechanism of action of methimazole in hyperthyroidism?

Explanation:
Methimazole lowers thyroid hormone levels by stopping the gland from making new hormones. It does this by inhibiting thyroid peroxidase, the enzyme that catalyzes iodination of tyrosine residues and the coupling reactions that form T3 and T4 inside thyroglobulin. When thyroid peroxidase is blocked, the synthesis of new thyroid hormones is reduced, so circulating levels fall over time. It doesn’t prevent iodide from entering the thyroid, nor does it stop the release of hormones that are already stored, and it doesn’t affect the conversion of T4 to T3.

Methimazole lowers thyroid hormone levels by stopping the gland from making new hormones. It does this by inhibiting thyroid peroxidase, the enzyme that catalyzes iodination of tyrosine residues and the coupling reactions that form T3 and T4 inside thyroglobulin. When thyroid peroxidase is blocked, the synthesis of new thyroid hormones is reduced, so circulating levels fall over time. It doesn’t prevent iodide from entering the thyroid, nor does it stop the release of hormones that are already stored, and it doesn’t affect the conversion of T4 to T3.

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