Cenforce 150 is a drug that contains 150mg of the active ingredient Sildenafil citrate and is used in the treatment of erectile dysfunction in men. Cenforce is a PDE5 inhibitor – this means it inhibits the action of the enzyme PDE5 in order to relax the muscles of the blood vessels in the penis thereby increasing blood flow to produce an erection. This effect however is achieved with the presence of sexual stimulation. This action increases the level of cyclic Guanosine Monophosphate (cGMP), which in turn enhances penile blood flow and helps attain and sustain an erection when a person is sexually stimulated.