The s?k?nt? for impotent males is that they are not able to have hard penis erections on their own. Thus you ki?i think of this pill kak?m the one that sevimli help you in getting a hard erection.In vitro studies have shown that sildenafil is selective for phosphodiesterase-5 (PDE5) . Its effect is more potent on PDE5 than on other known phosphodie