비아그라에 대한 확실한 가이드

If the cGMP is destroyed by the phosphodiesterase-five enzyme, the erection finishes. Viagra stops phosphodiesterase-5 from destroying cGMP so cGMP stays about longer, which leads to a more extended erection. Never consider this medication with another item that contains sildenafil or other comparable medicines for erectile dysfunction-ED or pulmo