Erectile dysfunction is among the most common dysfunction that frustrates most men young or old. It can be a temporary problem or ongoing one. It can be frustrating and also depressing for guys in addition to his partner. Viagra pioneered the effective strategy to erection dysfunction. But it appears as if it's been transferred to Cialis. Cialis manufactured by Eli Lilly is FDA approved prescription strategy to impotence. The difference between Cialis and also other FDA approved anti impotence treatment drugs Viagra and Levitra would be the fact that one works best for long time approximately 36 hours. It also takes only half an hour showing its effects, after intake. Cialis is prescription drug to the management of erectile dysfunction. It is PDE - 5 inhibitor, it improves the flow of blood into penis by inhibiting PDE - 5 enzymes. It is essential to have sexual stimulation, physically or mentally.