system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 38-year-old woman develops palpitations, weight loss, and heat intolerance. On examination, she has a mild tremor, an enlarged thyroid, and resting tachycardia. Biochemical tests confirm the diagnosis and she is started on methimazole. Which of the following is the most likely mechanism of this drug?
assistant
The correct answer is  Methimazole is an effective treatment for hyperthyroidism. Methimazole interferes with thyroid function mainly by inhibition of thyroidal organic binding and coupling reactions. In contrast to other agents such as perchlorate, the action of thioamides is not prevented by large doses of iodide.