CIALIS - AN OVERVIEW

Each Cialis and vardenafil occur as tablets that you simply swallow. Cialis is often taken at the time on a daily basis or as desired for sexual action. Vardenafil is taken only as necessary for sexual activity.Tadalafil is often synthesized starting from (D)-tryptophan methyl ester and piperonal by way of a Pictet–Spengler response. This is cert