For erectile dysfunction, Cialis is prescribed for one of the following reasons: On an as-needed basis several hours before sexual activity As a once-daily medication to allow for spontaneity ...

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 ...

Cialis and tadalafil doses are 5 mg, 10 mg, and 20 mg. Cialis also has a lower dose of 2.5 mg that you can take daily. The reasoning behind this is that over time, Cialis stays in your system and ...