Patients aged < @years with normal preoperative EF who underwent nsRP for localised prostate cancer ( Gleason @ , prostate-specific antigen -LSB- PSA -RSB- < @ng/mL ) were randomised after nsRP @:@:@ to @-month double-blind treatment with tadalafil @mg OaD , tadalafil @mg PRN , or placebo , followed by @-week drug-free washout , and @-month open-label OaD treatment ( all patients ) .