Cenforce 150 MG of sildenafil citrate is that the salt contained in Cenforce 150mg. This drug falls within the category of Phosphodiesterase- 5 inhibitors, which is an enzyme present within the body. The drug acts by inhibiting the action of this PDE- 5, leading to escalated levels of another enzyme- cGMP. This, in turn, recuperates the blood flow to the penis and helps in prolonging erection.