Sildenafil Citrate is a drug which relaxes muscles and increases blood glow to specific areas of the body. This drug is primarily used to treat erectile dysfunction or impotence in men. This drug is also used to enhance exercise capability in men and women along with treating pulmonary arterial hypertension. This drug does not cause penis erection but this drug helps in erection when there is physical or psychological sexual stimulation. Sildenafil is available in various forms like tablets, chewable tablets, effervescent tablets or oral jelly.