Efficacy and safety of two dosing regimens with Tadalafil in Spanish men with erectile dysfunction: results from the SURE study in 14 European countries

[corrected] To compare the efficacy and safety of tadalafil 20 mg administered 3 times/week (SCH) vs. on demand (OD) in a cohort of Spanish men with erectile dysfunction (ED), since Tadalafil period of responsiveness lasts up to 36 hours post-dosing. The 418 Spanish patients participating in the European multicenter, crossover, open-label SURE clinical trial (comprising 4262 men) were randomly assigned to one of the treatment sequences: tadalafil 20 mg SCH for 5-6 weeks followed by tadalafil 20 mg OD for 5-6 weeks, or the inverse sequence. At completion, patients were asked to select the regimen they preferred to receive in an extension phase. In both regimens, tadalafil led to a similar improvement in erectile function compared to baseline. However, the SCH regimen showed statistically significant higher scores for several IIEF questions (i.e. sexual desire domain). Normal erectile function (IIEF EF domain score > or = 26) was achieved by 69.3% of patients on SCH and 64.3 % on OD, with a sexual intercourse success rate (SEP3) of 75.6% and 72.2% respectively (p