What are the common adverse effects of propranolol when used for migraine prevention?

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Multiple Choice

What are the common adverse effects of propranolol when used for migraine prevention?

Propranolol is a nonselective beta-adrenergic blocker, so its adverse effects come from blocking both beta-1 receptors in the heart and beta-2 receptors in the lungs. The most common issues you see with this drug for migraine prevention are fatigue, bradycardia (slower heart rate), and hypotension (lower blood pressure) due to reduced cardiac output and sympathetic tone. Because it also blocks beta-2 receptors in bronchial smooth muscle, it can provoke bronchospasm, which is why there is particular caution in patients with asthma or COPD when using nonselective propranolol. This combination of fatigue, slow heart rate, and low blood pressure, plus the potential for bronchospasm in susceptible individuals, makes that option the best reflection of the typical safety profile. Dry mouth with urinary retention would point more toward anticholinergic effects, which aren’t characteristic of propranolol. Hypertension and insomnia aren’t the classic pattern for propranolol’s adverse effects (the drug tends to lower blood pressure rather than raise it, and sleep disturbances can occur but aren’t the defining set here). Weight gain and edema aren’t the hallmark adverse effects either.

Propranolol is a nonselective beta-adrenergic blocker, so its adverse effects come from blocking both beta-1 receptors in the heart and beta-2 receptors in the lungs. The most common issues you see with this drug for migraine prevention are fatigue, bradycardia (slower heart rate), and hypotension (lower blood pressure) due to reduced cardiac output and sympathetic tone. Because it also blocks beta-2 receptors in bronchial smooth muscle, it can provoke bronchospasm, which is why there is particular caution in patients with asthma or COPD when using nonselective propranolol. This combination of fatigue, slow heart rate, and low blood pressure, plus the potential for bronchospasm in susceptible individuals, makes that option the best reflection of the typical safety profile.

Dry mouth with urinary retention would point more toward anticholinergic effects, which aren’t characteristic of propranolol. Hypertension and insomnia aren’t the classic pattern for propranolol’s adverse effects (the drug tends to lower blood pressure rather than raise it, and sleep disturbances can occur but aren’t the defining set here). Weight gain and edema aren’t the hallmark adverse effects either.

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