MEN AYURVEDIC   relaxes muscles of the blood vessels and increases blood flow to particular areas of the body. Sildenafil  is used to treat ERECTILE DYSFUNCTION (impotence) in men. Sildenafil is a phosphodiesterase-5 (PDE-5) inhibitor. It works by relaxing the blood vessels in your penis, thereby increasing blood flow into the penis on sexual stimulation. This helps you achieve and maintain a hard, erect penis suitable for sexual activity.