Background. Enteral insufficiency syndrome accompanies the development of many acute diseases of the abdominal cavity. According to the statistics, advanced and multi-organ surgical intervention in oncosurgery within the period from 2019 to 2020 resulted in enteral insufficiency being a complication in 39% of all cases, regardless of anatomical and physiological area, while complications in the form of endogenous intoxication syndrome made up 68% of cases. Purpose – studying the effectiveness of treatment of enteral insufficiency syndrome in cancer patients after multiorgan surgery with severe endogenous intoxication by means of indirect electrochemical detoxification with sodium hypochlorite solution. Materials and methods. The study involved 71 cancer patients who underwent multi-organ surgery on different anatomical and physiological areas. The patients were divided into 2 groups: treatment group (n=36) provided with indirect electrochemical detoxification by means of sodium hypochlorite solution at a concentration of 0.06%, comparison group (n=35) undergoing treatment according to standard schemes. The groups were comparable in age and anatomical and physiological areas that were operated on (surgery was performed on the chest and mediastinum as well as abdominal organs). Results. The method of electrochemical detoxification with sodium hypochlorite reducing the indicators that reflect blood toxicity and intoxication level was used for treating patients with enteral insufficiency. This was evidenced by decreased concentration of bilirubin by 23.1%, urea by 91.6%, creatinine by 99.4%, LII (leukocytal intoxication index) by 47.2% and procalcitonin by 68.2%. Being applied this method has made it possible to achieve a detoxifying effect early on day one. Conclusions. The findings of complete physical examination of cancer patients after multiorgan surgery with severe endogenous intoxication have shown a practical significance of sodium hypochlorite being included in comprehensive post-surgery treatment in enteral insufficiency syndrome cases. Infusions of 0.06% NaClO solution within 24 hours have been proved to provide a detoxifying effect: they significantly reduce elevated concentrations of bilirubin, creatinine, urea, LII and improve blood rheology. Administering sodium hypochlorite in the suppre-ssion of antioxidant defense mechanisms leads to the activation of oxidative processes. Including sodium hypochlorite in comprehensive post-surgery treatment in enteric insufficiency syndrome has shown a high efficiency.