Should you use a Cenforce d Tablet if you want to have a long erection with your partner. The active ingredient is sildenafil which is used to treat impotence problems. This drug is the best medicine for the treatment of men suffering from impotence. The active ingredient is sildenafil. The effect lasts for 4-5 hours, so men should take this medicine 30 minutes before sexual intercourse, the effect lasts for 4-5 hours.