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Introduction: To investigate the change of erection duration measured by stopwatch with flexible dose vardenafil administered for 8-week in subjects with erectile dysfunction (ED).Material and methods: Effect of levitra on sustenance of erection (EROS) was an open-label, prospective, multicenter, single-arm study designed to measure the duration of erection in men with ED receiving a flexible dose ofvardenafil over an 8-week treatment period.Patients were instructed to take vardenafil 10 mg 60 min prior to attempting intercourse.