비아그라에 대한 새로운 단계별 지도

Sildenafil belongs to a class of medicine termed phosphodiesterase type five (PDE5) inhibitors. A category of medicine is a bunch of drugs that get the job done in an analogous way. These drugs are sometimes utilised to treat identical disorders.Sildenafil is really a powerful and selective inhibitor of cGMP-particular phosphodiesterase sort 5 (PDE