Cenforce fm is a drug used to treat the medical condition of erectile dysfunction (ED) in men. Erectile dysfunction occurs when the patient is unable to achieve a proper penile erection during sexual intercourse. The main active ingredient in this drug is sildenafil, which works to relax the penile arteries in the body. As a result, blood flow to the pelvic region increases. When the blood flow to the penis increases, it becomes easier for the man to initiate an erection during intercourse. The effect of this medicine usually lasts for 3-4 hours.