Kamagra Oral Jelly is a popular medication used to treat erectile dysfunction (ED) in men. It is a gel-like formulation containing the active ingredient Sildenafil Citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor.Sildenafil Citrate works by increasing blood flow to the penis during sexual stimulation, allowing men to achieve and maintain an erection. It is the same active ingredient found in Viagra and is effective for up to 4 to 6 hours.