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Viagra The drug restores the normal response to sexual stimulation. Properly, the physiological mechanism that provides an erection is not possible without the isolation of nitric oxide in the cavernous body during sexual stimulation. It activates a special enzyme called guanylate cyclase, which results in increased levels of cGMP (cyclic guanosine monophosphate), relaxing the muscles of the corpora cavernosa and increasing blood flow to the genitals. Sildenafiles, an active ingredient in VIAGRA, is a selective inhibitor of PDE5 (phosphodiesterasade type 5), which has a breakdown of cGMP in the corpora cavernosa. The drug is characterized by the peripheral action in the erection of the penis. It is noteworthy that sildenafil relaxes the corpora cavernosa not directly, but uses the function of relaxing nitrogen oxide. Before considering Generic Viagra for sale , it is very required to follow some issues for seller mentioning below The drug was well tolerated in healthy...