비아그라에 대한 5가지 쉬운 사실 설명

an erection that will not go away (priapism). If you have an erection that lasts in excess of four hours, get professional medical aid straight away. If It is far from taken care of right away, priapism can completely damage your penis.Sildenafil is usually a strong and selective inhibitor of cGMP-certain phosphodiesterase style 5 (PDE5), which hap