Impotence in men is treated with Levitra. I purchased Levitra online from a reputable company, which is the best place to buy Levitra online. Vardenafil, one of its components, boosts blood flow to the penis. It inhibits PDE 5 and enhances blood flow to the penis by relaxing the muscles that line the blood vessels. An enzyme called PDE 5 constricts the arteries, preventing normal blood flow. An erection must take place under cGMP manufacturing conditions. Blood is transported to and from the penis via cGMP. PDE 5 inhibits natural erections and reduces cGMP levels.