Fourteen healthy volunteers received oral doses of azithromycin ( Zithromax ) once-daily, over three days (500 mg/day) and over five days (500 mg on day 1, follo by 250 mg/day on days 2-5). Comparison of the pharmacokinetics of three-day and five-day regimens valtrex of azithromycin ( Zithromax ) in plasma and urine.In an open crossover study, t