Zenegra 50 mg consists of Sildenafil which belongs to the organization of drug remedies called Phosphodiesterase type 5 (PDE 5) inhibitors. Erectile dysfunction (moreover referred to as impotence) is a sexual condition where a man can't hold a hard erected penis that is required for regular sexual activity. It takes place due to decreased blood waft to the penis this is caused due to narrowing of the blood vessels offering the penis. Sildenafil improves penile erection (make penis company) within the direction of sexual intercourse. It acts via relaxing the blood vessels providing the penis which consequently improves penile blood flow and oxygen supply.