Cenforce FM 100 mg is marketed as a medicine for erectile dysfunction (ED). However, products sold under similar names can have different formulations, so the active ingredients and strength should always be checked on the packaging. If the product contains sildenafil 100 mg, it belongs to a group of medicines called PDE5 inhibitors. Sildenafil works by increasing blood flow to the penis during sexual stimulation, helping men achieve and maintain an erection.