비아그라에 대한 5가지 쉬운 사실 설명

Sildenafil belongs to a class of medicines known as phosphodiesterase kind five (PDE5) inhibitors. A class of medication is a gaggle of drugs that function in an analogous way. These medicines tend to be applied to treat very similar circumstances.But For those who have an erection that lasts extended than four hours, seek the advice of a doctor st