The problem of ED arises due to lack of proper blood flow to the . As a result, the penis does not get a proper (firm) erection during activity. There may be several reasons (physical or psychological) for insufficient blood flow to the . Cenforce 150 mg tablets contain Sildenafil Citrate which inhibits the action of PDE5. This relaxes the muscles present in the. The penile blood vessels get expanded and enlarged, resulting in increased blood flow to the . This allows men with ED to get and maintain an erection during.