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All these medicines are Phosphodiesterase – 5 (PDE-5) Inhibitor which increases blood flow through the Penis during Sexual Intercourse. In fact Erectile dysfunction to male person happens when the penis is not getting enough blood through it during sexual excitement to get proper and sustained erection. The generic names of these medicines are as below: Viagra – Sildenafil Citrate Levitra– Vardenafil HCI Cialis– Tadalafil Among three Impotence drugs above, Levitra contains more efficient PDE – 5 Enzyme Inhibitor. Now let us discuss the effectiveness of these three medicines: Viagra– Sildenafil Citrate - Effect of this medicine takes 30 minutes to reach to maximum concentration. order viagra softtabs viagra to buy in edinburgh cialis thirst buy cialis canadian viagra syrup