Therapy effectiveness and patient satisfaction were evaluated using established and new questions on erectile function. Behavioural, psychological, and relationship outcomes were assessed using the short form of the Psychological and Interpersonal Relationship Scales (SF-PAIRS).

In nine European countries at 904 sites, 8047 patients were enrolled and 94% (7560) selected either tadalafil (5315), sildenafil (1252), or vardenafil (993) for treatment at baseline. Of the 7560, 3998 (52.9%) took the same drug for 6 mo. Baseline characteristics across the three treatment groups were comparable: mean age approximately 56 yr, moderate or severe ED, and mean International Index of Erectile Function-Erectile Function domain score about 13. Tadalafil, sildenafil, and vardenafil were therapeutically effective and improved patient satisfaction in the 40–58% of men who completed 6 mo of a single therapy. Patients taking tadalafil consistently had numerically higher levels of therapeutic effectiveness and satisfaction compared with patients who took sildenafil or vardenafil. The three cohorts had statistically significant changes from baseline in response to SF-PAIRS and there were significant differences, in favour of tadalafil, among cohorts in the Time Concerns domain.

In a large observational study that mimics a routine clinical setting, most patients selected an inhibitor of phosphodiesterase 5 to treat ED, which resulted in a high level of therapeutic effectiveness and patient satisfaction.