Sildenafil citrate, a medication used to treat erectile dysfunction in men, is found in Cenforce 100 Medicine. It works by blocking the PDE-5 enzyme, which causes erections by relaxing blood vessels in the penis. Only when sexual stimulation is present does this effect occur. The firm that makes this pharmaceutical, Centurion Laboratories Ltd., states that it is not intended for youngsters. It is neither an aphrodisiac nor a preventative for sexually transmitted infections.