kamagra oral jelly contains sildenafil as an active ingredient. which increases blood flow in the range and relaxes blood vessels. So this drug helps men to get longer erections with their partners. The effect of this medicine lasts for 4-5 hours. Men should take this medicine 30 minutes before sexual intercourse. You should not eat heavy food and you should not consume alcohol while taking this medicine. It is necessary to seek the help of a doctor