Cenforce is a generic equivalent of Viagra. Both contain the same active ingredient, sildenafil citrate. It is often recommended for the treatment of erectile dysfunction or impotence. Enforce is available as a light blue diamond-shaped tablet for oral use. It does not protect against sexually transmitted diseases (STDs) and improves sexual dysfunction by increasing blood flow to the penile region. The active ingredient sildenafil citrate has revolutionized the treatment of erectile dysfunction. It was discovered by a group of scientists working at Pfizer. The Food and Drug Administration approved sildenafil citrate for the treatment of erectile dysfunction in 1998. It has the molecular formula C22H30N6O4S and a molecular weight of 474.58 g / mole. In addition to erectile dysfunction, this drug molecule is also helpful in the treatment of pulmonary hypertension in adults. Sildenafil Citrate is available in dosages like 20 mg, 25 mg, 50 mg, and 100 mg. The 25 mg, 50 mg, and 100 mg doses are used to control erectile dysfunction.