Kamagra 100 mg is a medication used to treat erectile dysfunction (ED). It contains sildenafil citrate, which is the same active ingredient found in Viagra. Kamagra 100 mg works by inhibiting the enzyme phosphodiesterase type 5 (PDE5). This leads to an increase in cyclic guanosine monophosphate (cGMP), which relaxes the smooth muscles in the blood vessels of the penis and enhances blood flow. This helps achieve and maintain an erection in response to sexual stimulation.