Kamagra Oral Jelly is a medication used to treat erectile dysfunction (ED) and sometimes premature ejaculation. It contains sildenafil citrate, which is the same active ingredient found in Viagra.Sildenafil citrate helps relax the blood vessels in the penis, increasing blood flow and facilitating an erection in response to sexual stimulation.Headaches, flushing, indigestion, nasal congestion, dizziness, and visual disturbances.