FIELD: medicine, homeopathy, pharmacy. SUBSTANCE: invention relates to a medicinal agent comprising activated form of monoclonal, polyclonal or natural antibodies raised to cholecystokinin used in small or supersmall doses prepared by multiple successive dilution and by external effect being carried out by homeopathic technology. Invention relates also to method of treatment of functions of hepatobiliary system by modification of effects of endogenous cholecystokinin that involves the use of activated forms of antibodies raised to cholecystokinin taken in small and supersmall doses prepared by successive dilution and by external effect being preferably in different but preferable hundredth homeopathic dilutions of indicated antibodies. Invention provides the development of effective, safety agent used for treatment of damages of hepatobiliary system function and no causing the formation of tolerance. Invention can be used for treatment of damages of function of hepatobiliary system of different etiology. EFFECT: improved method and enhanced effectiveness of treatment. 3 cl, 5 tbl, 5 ex
