Cenforce is a brand of sildenafil citrate, which is a medication used to treat erectile dysfunction (ED) in men. Erectile dysfunction is a condition where a man is unable to achieve or maintain an erection sufficient for sexual activity. Sildenafil citrate, the active ingredient in Cenforce, belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. It works by increasing blood flow to the penis during sexual stimulation, which helps men achieve and sustain an erection.