The problem that 40 to 50 percent of men feel sad during intercourse nowadays is called impotence or erectile dysfunction. The best medicine for this problem is Cenforce D . This medicine contains an ingredient called sildenafil which helps men to get stronger, harder and longer erections during intercourse. You can take this medicine before or after food. The effect of this medicine lasts for 4 to 6 hours. Do not consume fatty foods or alcoholic beverages with this medicine.