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Medical Definition of Doxazocin
1. An antihypertensive agent that selectively blocks the a1 (postjunctional) subtype of alpha-adrenergic receptors; resembles prazocin in pharmacologic actions. Prevents the blood pressure elevating effects of norepinephrine, phenylephrine, and other agonists at vascular a1-receptors. (05 Mar 2000)