Erectile dysfunction is inability of a man to achieve and maintain erection necessary for satisfactory sexual function. This term came to replace «impotence» term, was proposed in 1988 by US National Institute of Health and since 1992 has been adopted by international organizations of urologists and andrologists.
Problem of impotence has not only medical, but also extremely important social significance. Disharmony of sexual relations is often the cause of family breakdown, infertility, depression and even suicide.
At present, there is tendency of increasing frequency of erectile dysfunction cases; it is estimated that this disease affects over 100 million men in the world. Because of false modesty or lack of qualified specialists or for other reasons most men either do not go to doctor, or do it untimely. This in its turn leads to disappointing results of therapy and establishment of the opinion among men that treatment of this disease is of low effectiveness.