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 ...

Although erectile dysfunction (ED) is a common impairment among older men, its etiology is poorly understood, and cross-sectional studies concerning associations with modifiable behavioral risk ...

About 25 percent of ED cases are thought to be associated with medications, such antidepressants, NSAIDs (e.g., ibuprofen and ...