In recent years, a common strategy for the prevention of postsurgical intra-abdominal adhesions has been intrasurgical placement of adhesion barriers into the peritoneal cavity. Osmotic agents, such as various polysaccharides, frequently are used as antiadhesive materials. The effects of these materials on kidney function have not yet been studied. We report a case of an individual with pre-existing chronic kidney disease who developed acute kidney injury after surgical placement of an antiadhesive barrier of macromolecular polysaccharides. A kidney biopsy, performed because of persistent kidney failure, showed tubular cell lesions compatible with osmotic nephrosis lesions. This case suggests that use of polysaccharide-containing antiadhesive barriers can induce severe kidney damage. Such barriers should be used with caution in patients with abnormal kidney function to prevent irreversible damage.