비아그라의 주요 지침

Sildenafil belongs to a class of medicines referred to as phosphodiesterase form 5 (PDE5) inhibitors. A class of medicines is a bunch of drugs that do the job in an identical way. These medications in many cases are utilised to deal with comparable conditions.Sildenafil is a strong and selective inhibitor of cGMP-particular phosphodiesterase type 5