Kamagra Oral Jelly is taken for impotence or erectile dysfunction in men. This jelly contains an ingredient called sildenafil which helps in increasing the blood flow to the tissues of the penis in men. This jelly works effectively when taken 30 minutes or 1 hour before sexual intercourse. You can take this jelly before or after food. The effect of this jelly lasts for 4 to 6 hours. This jelly is only taken by men aged 18 to 65 years.