Sildenafil citrate, the main and most active component of Extra Super P Force tablets, functions as an inhibitor of the phosphodiesterase type-5 (PDE-5) enzyme, which is specific to cGMP. By dissolving cGMP, this enzyme promotes smooth muscle relaxation.

When PDE-5 is inhibited, the smooth muscles' cGMP levels increase, resulting in a relaxation of the muscles and a dilation, or widening, of the blood vessels.

Given how widely recognized sildenafil is as a PDE-5 inhibitor, the viagra Extra Super P Force tablets are also members of this class.