An over-the-counter drug called Cenforce 150 is intended to assist men who suffer from erectile dysfunction, also referred to as impotence. Sildenafil Citrate, an inhibitor of phosphodiesterase type 5 (PDE5), is the active component of Cenforce, much like it is in Viagra. For those who do not know, Viagra is a well-known medication used to treat male impotence worldwide. Cenforce is available without a prescription, however it is different from Viagra in that it does not contain all of the extra ingredients that are present in Viagra's formulation. This makes Cenforce more widely available while maintaining its efficacy as an erectile dysfunction medication.