"A Double-blind Preferred Vardenafil Dose Study of QoL and Functional Outcomes in Males With Erectile Dysfunction"

10mg Vardenafil for 4 weeks followed by an 8 week titration period when subjects may be titrated up to 20mg Vardenafil or down to 5mg Vardenafil followed by 14 weeks treatment at preferred dose.

10mg placebo for 4 weeks followed by an 8 week titration period when subjects may be titrated up to 20mg placebo or down to 5mg placebo followed by 14 weeks placebo at preferred dose