Suhagra 100 inhibits the action of PDE 5 and allows the blood to flow properly. This leads to the production of cGMP that is responsible for the contraction and dilation of blood vessels. As more and more blood flows to the penis, the pressure is created in the penis. This leads to an erection. Suhagra 100mg Tablet is a phosphodiesterase (PDE-5) inhibitor. It works by increasing blood flow to the penis by relaxing the muscles in penile blood vessels.