The active ingredient in the Cenforce 50 tablet is sildenafil, which is used to treat men suffering from erectile dysfunction and impotence. The effect of this medicine lasts for 4-5 hours so men should take this medicine 30 minutes before sexual intercourse. The effect of this medicine lasts for 4-5 hours so men should take this medicine only once a day. 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.