Silagra 100 mg incorporates Sildenafil which belongs to the institution of drugs referred to as Phosphodiesterase kind 5 (PDE 5) inhibitors. Erectile disorder (additionally referred to as impotence) is a sexual situation wherein a person cannot maintain a tough erected penis that is required for everyday sexual activity. It occurs because of reduced blood waft to the penis that is precipitated because of narrowing of the blood vessels providing the penis.