비아그라 - 개요
an erection that won't go away (priapism). If you have an erection that lasts a lot more than four several hours, get health-related enable at once. If It's not necessarily treated immediately, priapism can forever harm your penisSildenafil boosts the impact of NO by inhibiting phosphodiesterase form 5 (PDE5), that's responsible for degradation of