비아그라에 대한 이 보고서 검토

When the cGMP is destroyed because of the phosphodiesterase-5 enzyme, the erection ends. Viagra helps prevent phosphodiesterase-5 from destroying cGMP so cGMP stays around extended, which ends up in a far more prolonged erection. Should you expertise a painful erection or an erection that lasts lengthier than 4 several hours, get crisis treatment