Kamagra is a medication used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate, which works by increasing blood flow to the penis, helping to achieve and maintain an erection during sexual activity. Kamagra belongs to a class of medications known as phosphodiesterase type 5 (PDE5) inhibitors. PDE5 is an enzyme that regulates blood flow to the penis. During sexual arousal, the release of nitric oxide causes the blood vessels in the penis to relax, which allows blood to flow into the erectile tissues and produce an erection.