vilitra40 is the most active ingredient in Vilitra, which ensures its effectiveness. Like many medications used to treat impotence, Vardenafil is a class of PDE5 inhibitors. The last category lists active agents that inhibit releases in PDE5 Chemical agents. They can impede the flow of blood, which is a crucial element in an erection. In actuality, erection comes from a strong blood supply to the penis's organ. If the blood flow is limited, the penis cannot get an erection strong enough to allow full sexual intercourse.