Chitosan-based gelatinous affinity sorbent containing 9 mg/ml of polymyxin B was injected into the infected peritoneal cavity for twenty-four hours for detoxification in diffuse peritonitis. The clinical assay of blood plasma (Spectrum Abbot, USA) revealed that the lavage of the infected abdomen by polymyxin B-containing adsorbent resulted in systemic detoxification. The effect was associated with normalization of direct bilirubin, cholesterol, and triglyceride levels, a 4-fold decrease in uric acid levels, and a 34-fold increase in alkaline phosphatase activity, and a greater than 70-fold enhancement of hepatic aspartate aminotransferase activity.