The invention relates to the use of a fixed combination of hyaluronic acid, chondroitin sulfate and aluminum hydroxide for the preparation of medicaments for treating gastric disorders, in particular for the prevention or for the treatment of gastritis or of gastric or duodenal endothelial damages, such as erosions or ulcers and a chewable glycosaminoglycan composition comprising said fixed combination for the prevention or for the treatment of gastritis or of gastric or duodenal endothelial damages, such as erosions or ulcers.