Background This multicenter, randomized, double-blind, double-dummy, placebo-controlled trial primarily evaluated the efficacy of tadalafil once-daily (OaD) or on-demand ("pro-re-nata"; PRN ...

Patients with previous experience with tadalafil OaD were excluded. The study was approved by the Comité de protection des personnes "Nord-Ouest IV", centre hospitalier universitaire, faculté de ...