Sildenafil (Viagra): Sildenafil acts quickly but has a shorter duration of effect. It is generally taken 30 minutes to an hour before sexual activity. Tadalafil (Cialis): Tadalafil has a slower onset, ...

France last year seized record quantities of illegally imported “erectile honey” laced with Viagra and other medications, ...

Fake versions can have toxic ingredients. Other such pills and supplements can contain dangerously high levels of sildenafil or tadalafil that are significantly outside of standard prescription doses.

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 ...