Cenforce is used to treat erectile dysfunction and impotence problems. The active ingredient is sildenafil which increases blood flow in the range and relaxes the blood vessels so this drug helps men to get a hard longer erection in their sex life. The effect of this drug lasts for 4-5 hours. This is why men should take this medicine 30 minutes before sexual intercourse. This medicine comes in different doses so it is necessary to consult your doctor while taking medicine.