Use Cialis and Go with It! After a series of successful medication approved for the erectile disfunction or the so-called impotence ( we may take as an example Sildenafil, known as "viagra, sold since 1998 and Vardenafil, also called "Levitra", found in pharmacies since late August 2003), another medication was created so as to complete the variety of these products and allow people to choose: this latest medication is tadafil(its commercial name is Cialis and could have been purchased since November 2003).