Kamagra 50 mg is a medication used to treat erectile dysfunction (ED). It contains sildenafil citrate, the same active ingredient found in Viagra. Sildenafil citrate, the active ingredient, inhibits the enzyme phosphodiesterase type 5 (PDE5). This leads to increased levels of cyclic GMP in the penis, which helps relax smooth muscle and dilate blood vessels, resulting in an erection.