Rasmussen Pharmacology Exam 3 Practice

Which drug is an alpha adrenergic blocker?

Lisinopril Metoprolol Prazosin Hydrochlorothiazide

Correct Answer:

Prazosin

Explanation:

Alpha adrenergic blockers work by blocking alpha-1 receptors on vascular smooth muscle, which prevents norepinephrine-induced vasoconstriction. This causes vasodilation and lowers blood pressure. Prazosin fits this mechanism exactly, making it the correct choice as the alpha-adrenergic blocker. Lisinopril is an ACE inhibitor, metoprolol is a beta-adrenergic blocker, and hydrochlorothiazide is a diuretic; none of these act primarily as alpha-1 blockers.

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