Extended duration of efficacy of vardenafil when taken 8 hours before intercourse: a randomized, double-blind, placebo-controlled study

This randomized controlled trial evaluated the efficacy and safety of vardenafil, a PDE5 inhibitor, when taken 8 hours before sexual activity in men with erectile dysfunction (ED). The study included 383 men with ED for over six months, who were randomized to receive vardenafil (5, 10, or 20 mg) or