Which drug is a competitive, reversible non-selective alpha antagonist used to diagnose and manage hypertensive crises associated with pheochromocytoma or clonidine withdrawal?
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Correct answer: Phentolamine
Phentolamine is a short-acting competitive antagonist. Unlike phenoxybenzamine, its effects are reversible and can be used acutely for blood pressure control during tumor surgery or to prevent tissue necrosis following catecholamine extravasation.
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