In a pooled analysis of all influenza-positive adults and adolescents (N = 2413) enrolled into treatment studies, oseltamivir 75 mg twice daily for 5 days reduced the median duration of influenza illness by approximately one day from 5.2 days (95% CI 4.9 – 5.5 days) in the placebo group to 4.2 days (95% CI 4.0 – 4.4 days; p ≤ 0.0001).