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If the cGMP is wrecked through the phosphodiesterase-5 enzyme, the erection finishes. Viagra stops phosphodiesterase-5 from destroying cGMP so cGMP stays all over for a longer time, which leads to a far more prolonged erection. When you working experience a agonizing erection or an erection that lasts for a longer period than 4 hours, get emergenc

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