비아그라 - 개요

In the event the cGMP is destroyed with the phosphodiesterase-five enzyme, the erection finishes. Viagra stops phosphodiesterase-5 from destroying cGMP so cGMP stays all over for a longer period, which leads to a far more extended erection. When you knowledge a agonizing erection or an erection that lasts for a longer time than four hours, get cri