Paper brings the basic information in pathophysiology, diagnostics and differential diagnostics in causes of the erectile dysfunction and provides an overview of the contemporary therapeutic possibilities, including the new substance - sildenafil citrate (VIAGRA™). It is stressed that sufficient knowledge and responsibility in the indication of therapy may highly support positive contribution of the erectile dysfunction and differentiate patients of the potential risk. At present, adequate form of treatment of erectile and sexual dysfunction exists for almost every patient. New remedies have broaden possibilities of treatment, however, they have not done the indication or therapy easier.

        Key words: erectile dysfunction, male infertility, andrologic examination, VIAGRA (sildenafil citrate), nitrogen