Pharmaceutical form comprising a glycosaminoglycan and a compound presenting independent or dependent pH quaternary ammonium groups, wherein the proportion of ammonium groups in the pharmaceutical form is between 0.01-2.0 µmol ammonium/mg pharmaceutical form, the proportion of glycosaminoglican in the pharmaceutical form is between 15 % to 50% w/w, and the pharmaceutical form presents a humidity percentage (w/w) lower than 10%. Pharmaceutical formulation comprising said pharmaceutical form, and their use for the manufacture of a medicament.