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Our objective was to evaluate the effect of itraconazole, a P-glycoprotein inhibitor, on the pharmacokinetics and pharmacodynamics of fexofenadine, a P-glycoprotein substrate, in relation to the multidrug resistance 1 gene (MDR1) G2677T/C3435T haplotype. A single oral dose of 180 mg fexofenadine was administered to 7 healthy subjects with the 2677GG/3435CC (G/C) haplotype and 7 with the 2677TT/3435TT...