Cenforce is a brand of medication used to treat erectile dysfunction (ED) in men. The active ingredient in Cenforce is sildenafil citrate, which belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. Sildenafil works by increasing blood flow to the penis during sexual stimulation, helping men achieve and maintain erections. Cenforce contains sildenafil citrate as its active ingredient. Sildenafil is the same active ingredient found in the well-known ED medication Viagra.