Are You Suffering From Impotence In Your Life That Can't Make Your Partner Happy So Men Should Use The Cenforce 120 Mg Tablet? The active ingredient is sildenafil which is similar to Viagra. This drug helps men to have a longer erection in their sex life. Men should take this medicine 30 minutes before sexual intercourse. The effect of this medicine lasts for 4-5 hours so it should be taken only once a day.