Penis erection is the flow of blood into the penis during arousal. If the penis receives a good supply of blood the penis would become rock-like hard and erect or else no matter how much you are excited the penis remains loose. Disruption of the blood flow towards the penis may happen due to n number of reasons. It could be smoking, drinking, drug abuse, injuries, or side effects of a medicine. To solve this problem Sildenafil Citrate, which is the main component Cenforce 150 mg relaxes the muscles in the penile region. The blood vessels of the penis are expanded to store a large quantity of blood. Overall a situation is created where it is ensured that blood will find no hindrance on its way to the penis.