Effects of Formulation and Dosing Strategy on Amprenavir Concentrations in the Seminal Plasma of Human Immunodeficiency Virus Type 1–Infected Men

Abstract
We compared seminal plasma pharmacokinetic data for the investigational amprenavir prodrug GW433908 with those for amprenavir and an amprenavir-ritonavir combination regimen. All 3 regimens resulted in detectable blood plasma and seminal plasma concentrations of amprenavir. The majority of these concentrations were greater than the plasma protein-corrected 50% inhibitory concentration for wild-type human immunodeficiency virus type 1.