Study to Compare the Tolerability and Efficacy of Once Daily Vardenafil vs Vardenafil PRN vs Placebo in Men Immediately After Nerve-sparing Prostatectomy for Improving ED

Inclusion Criteria

• •At Screening
• •Males 18-64 years of age
• •Scheduled to undergo bilateral nerve-sparing radical retropubic BNSRRP, as selected according to the investigator's usual clinical practice
• •Surgery scheduled within about 1 month of screening (Visit 1)
• •Expressed an interest in resuming sexual activity as soon as possible after prostatectomy
• •Heterosexual relationship
• •No pre-operative erectile dysfunction:
• •International Index of Erectile Function (IIEF) Erectile Function Domain Score score EF domain =26 at screening without any therapy/devices for improvement of erections
• •No perforation of the prostate capsule by tumor
• •At Randomization:
• •bilateral nerve-sparing during the retropubic prostatectomy documented on the operating report
• •BNSRRP occurred within approximately 1 month post screening (Visit 1)
• •No perforation of the prostate capsule by tumor:
• •No positive tumor margins confirmed after surgery: =T2 stage on pathology report from the surgery