The present invention relates to a composition for a medical device comprising a specific mucoadherent gelling complex composed of EPS exopolysaccharides of bacterial origin produced in situ in the gastrointestinal tract by specific selected bacterial strains in association with vegetable gums and/or animal and/or vegetable gelatines. Said complex is capable of establishing a complete barrier effect of a mechanical type extending throughout the whole gastrointestinal tract and can be used as a medication for the prevention and treatment of all pathologies connected to a deficiency in the barrier effect in the gastrointestinal area due to a low production of mucus such as by way of non exhaustive example intestinal permeability and bacterial translocation.
