A medicament based on antibodies contains an activated form of ultra-low doses of monoclonal, polyclonal, or natural antibodies to the prostate-specific antigen, the activated form being prepared by multiple consecutive dilutions and exposure to external factors, preferably according to homeopathic technology. In order to obtain the antibodies, the prostate-specific antigen isolated from the prostatic tissues of cattle or prepared synthetically is employed; a mixture of various, mostly centesimal, homeopathic dilutions is used. The method of treating diseases of the urogenital sphere consists in using activated forms of ultra-low doses of antibodies to prostate-specific antigen prepared by multiple consecutive dilutions and exposure to external factors.