Oral aprepitant increased the AUC of midazolam 2.3-fold on Day 1 and 3.3-fold on Day 5, when a single oral dose of midazolam 2 mg was co-administered on Days 1 and 5 of a regimen of oral aprepitant 125 mg on Day 1 and 80 mg/ day on Days 2 to 5.