cenforce tablet active ingredients include sildenafil. Denafil belongs to the class of medications called phosphodiesterase type 5 (PDE5) inhibitors. PDE5, an enzyme that regulates penile blood flow, is inhibited by PDE5 inhibitors. By blocking PDE5, sildenafil promotes blood vessel relaxation in the penis, increasing blood flow. This increased blood flow helps men get and maintain erections...