Kamagra is a prescription medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient Vardenafil, which is a​ PDE5 inhibitor (phosphodiesterase type 5 inhibitor). Like other ED medications such as Viagra (Sildenafil) and Cialis (Tadalafil), Levitra helps improve blood flow to the penis, making it easier to achieve and maintain an erection during sexual stimulation.