CIALIS is a prescription only tablet for the treatment of men with erectile dysfunction. This is when a man cannot get, or keep a hard, erect penis suitable for sexual activity. Following sexual stimulation CIALIS works by helping the blood vessels in your penis to relax, allowing the flow of blood into your penis. The result of this is improved erectile function. CIALIS will not help you if you do not have erectile dysfunction. It is important to note that CIALIS does not work if there is no sexual stimulation. Shop for Cialis from Chemist Direct and you can save a lot on your purchase.