During the azithromycin, telithromycin, and levofloxacin phases, plasma samples for midazolam will be collected at 0.25, 0.75, 1, 1.5, 2, 4, 6, 8, 10, 12, and 24 hours to allow for adequate sampling with drugs that potentially inhibit CYP3A. The 5+1 cocktail will be administered on day 4 after a minimum of 8-hour fasting.