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Acebutolol HCl (ABL) is a selective β-adrenergic receptor blocking agent that is preferably administered by the oral route despite its low bioavailability (30-50%). The purpose of this study was to evaluate the effect of verapamil HCl (VER) [as P-glycoprotein inhibitor (P-gp)] on the intestinal absorption of ABL by comparing the changes in the absorption rate constant (k ) of ABL. intestinal perfusion was conducted in healthy male Wistar albino rats to study the absorption phase of ABL. Eighteen rats were divided into three groups. The