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It does this by inhibiting an enzyme called phosphodiesterase 5. However, Viagra inadvertently also inhibits phosphodiesterase 6, which is very similar to phosphodiesterase 5, but with far more different and unexpected effects 8211; it overly sensitizes rod cells in the retina.

The device consists of an acrylic tube and a pumping mechanism, which can be a squeeze ball, a hand grip, a plunger, or an electric device. As the user pumps air out of the tube, the resulting vacuum increases blood flow into his erectile tissue. He then slides a "constriction ring" over the base of his penis to maintain the erection when he removes the tube.

The dose of Viagra for erectile dysfunction is usually 25 mg to 100 mg taken not more than once per day between 30 minutes and 4 hours prior to sexual intercourse. ) Missing A Dose.]