Kamagra jelly contains sildenafil citrate as active ingredient. Kamagra jelly is also known as sildenafil citrate jelly. Sildenafil jelly is used to treat erectile dysfunction among men. it works by blocking PDE 5 enzyme and increase blood flow in the penile arteries so that men can get strong erections and treat impotence effectively. Erections stay for up to 4-6 hours.