Cialis is an oral medication used in oral erectile dysfunction treatments therapy. The Food and Drug Administration - FDA - approved it in 21 November 2003 as the third impotence prescription drug after sildenafil (Viagra) and vardenafil (Levitra). By having a long lasting effect, Cialis allows men to enjoy a fully normal sex life without having to plan the sexual act. Men are free to choose with their partners the right moment and the right time. Cialis means no planning.