Click Here To Buy Now Sildenafil 200 is a medication used to treat erectile dysfunction (ED) in men. It contains Sildenafil Citrate, which is the same active ingredient found in popular medications like Sildenafil (the active ingredient in Sildenafil 200) works by inhibiting an enzyme called phosphodiesterase type 5 (PDE5). This enzyme breaks down a chemical called cyclic GMP, which helps relax the blood vessels in the penis, allowing for increased blood flow and, consequently, an erection. This process is triggered by sexual stimulation.