Cenforce 100 mg is a medication used to treat erectile dysfunction (ED) in men. It contains the active ingredient Sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. Sildenafil works by increasing blood flow to the penis during sexual stimulation, facilitating the ability to achieve and maintain an erection.  Active Ingredient: The active ingredient in Cenforce 100 mg is Sildenafil citrate. Mechanism of Action: Sildenafil inhibits the action of the enzyme PDE5, which is responsible for breaking down cyclic guanosine monophosphate (cGMP). Increased levels of cGMP lead to the relaxation of smooth muscle cells in the blood vessels of the penis, allowing for improved blood flow and the promotion of an erection.