Cenforce 100 mg tablets contain sildenafil as the active ingredient. which is the best medicine for the treatment of erectile dysfunction and impotence problems. This drug helps men to have a longer erection in their sex life. The effect of this medicine lasts for 4-5 hours so men should take this medicine 30 minutes before sexual intercourse. You should not eat heavy food and not consume alcohol while taking this medicine. It is important to consult your doctor while taking this medicine.