Which medication is a nonselective beta-blocker commonly used for migraine prophylaxis, tachycardia in hyperthyroidism, and essential tremor?

Which medication is a nonselective beta-blocker commonly used for migraine prophylaxis, tachycardia in hyperthyroidism, and essential tremor?

• A. Propranolol
• B. Metoprolol
• C. Atenolol
• D. Nadolol

Answer: (A)

Blocking both beta-1 and beta-2 receptors reduces the sympathetic overactivity that drives tachycardia in hyperthyroidism, helps lessen essential tremor, and can prevent migraine attacks. Propranolol fits this pattern because it is nonselective and can enter the brain, giving central effects that help with migraine prophylaxis and tremor. It also provides peripheral beta-1 blockade to lower heart rate in hyperthyroid tachycardia, and at higher doses it inhibits peripheral conversion of T4 to the more active T3, adding another layer of thyroid-related relief. Metoprolol and atenolol mainly block beta-1 receptors and have less impact on tremor and migraine, making them less suitable for those indications. Nadolol is nonselective like propranolol but has less central penetration and is not as commonly used for migraine prophylaxis. Propranolol remains the classic choice for all three conditions.

Blocking both beta-1 and beta-2 receptors reduces the sympathetic overactivity that drives tachycardia in hyperthyroidism, helps lessen essential tremor, and can prevent migraine attacks. Propranolol fits this pattern because it is nonselective and can enter the brain, giving central effects that help with migraine prophylaxis and tremor. It also provides peripheral beta-1 blockade to lower heart rate in hyperthyroid tachycardia, and at higher doses it inhibits peripheral conversion of T4 to the more active T3, adding another layer of thyroid-related relief.

Metoprolol and atenolol mainly block beta-1 receptors and have less impact on tremor and migraine, making them less suitable for those indications. Nadolol is nonselective like propranolol but has less central penetration and is not as commonly used for migraine prophylaxis. Propranolol remains the classic choice for all three conditions.