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Purpose. P-glycoprotein (P-gp) is made responsible for the limited oral bioavailability of P-gp substrates like peptidic HIV protease inhibitors (PIs). With respect to combined application of two PIs in antiretroviral regimes, we first investigated the influences on intestinal saquinavir uptake using different PIs in in situ perfusion studies. Methods. Perfusion experiments were carried out...