What Is Cenforce 100? Cenforce 100 is a prescription medication used to treat erectile dysfunction in men. It contains sildenafil citrate, the same active ingredient found in the well-known Viagra. Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor, which means it helps relax the blood vessels in the penis, increasing blood flow during sexual arousal and resulting in an erection....