Sildenafil citrate is the active ingredient in penegra 50 mg pill, which is informally also called (blue pill). This tablet is used for the treatment of erectile dysfunction (ED), which is also called impotence, in men. Erectile dysfunction is a condition or situation where a man is unable to get and /or maintain a penile erection adequate enough of sexual intercourse. It occurs when there is a decreased blood circulation to the penis. The decreased blood circulation may be due to physical complications such as an injury or disease or due to some psychological conditions for instance: Anxiety, Stress, Depression, etc. chronic lifestyle factors like: Drinking, Obesity, Smoking etc. could also contribute to ED. How Penegra 50 mg Works Penegra 50 mg tablet relaxes the smooth muscles present in the wall of blood arteries and helps in enhancing the circulation of blood to the penis. It functions well when the underlying cause of erectile dysfunction problem is  psychological, physical or both. If the underlying cause of erectile dysfunction is psychological, penegra 50 mg medicine may or may not function, based on the severity of the condition. In case of psychological causes alone or psychological (including lifestyle) and physical causes, it is important to undergo psychological counseling to undergo psychological counseling to get the best possible effect along with the standard of care or treatment which may include penegra 50 mg medicine.