Tadalis SX is used to treat sexual impotence in men who are not able to achieve and maintain the hardness of the penis required for sexual activity. This occurs as a result of insufficient blood supply to the penis. Tadalis SX is a famous generic Cialis, i.e. has the same properties as the original, but produced by another pharmaceutical company at a slightly modified formula. So, Tadalis SX can relax the walls of blood vessels in the penis, thereby increasing blood flow and cause the onset of erection. However, the drug will only work during sexual stimulation: only by making the drug an erection will not occur.