Cialis 5Mg (Tadalafil) TabletTadalafil Is In A Class Of Medications Called Pde5 Inhibitors. It Works To Treat Erectile Dysfunction By Increasing Blood Flow To The Penis During Sexual Stimulation. This Increased Blood Flow Can Cause An Erection Once You Are Sexually Aroused.  Tadalafil Will Not Give You An Instant Erection – You Must Be Sexually Aroused For It To Work.Tadalafil Has Been Proven To Help Men With Erectile Dysfunction Get A Hard Erection And Maintain It For Sexual Intercourse.They Begin To Take Effect After 30-60 Minutes And Once One Tablet Has Been Taken, It Is Then Effective For Up To 36 Hours, Offering Longer Lasting Effects In Comparison To Other Medications On The Market.