Decreased blood flow to the penis causes erectile dysfunction in which men are unable to get and maintain a solid erection. Men with this problem are called impotent and there is only one best way to beat the condition of impotence and that is Malegra 100. This medicine contains an active ingredient called Sildenafil Citrate which works to harden the penis and increase the blood flow in the penis. This medicine is not harmful to health, so you can take this medicine even without consulting a doctor.