Abstract: The present invention relates to pharmaceutical compositions for the oral administration of pharmacologically active molecules, comprising a release means consisting of porous zeolite in powder form, incorporating pharmacologically active molecules inside the pores and/or on its surface, the relative use for the preparation of drugs for oral administration, in particular for the treatment of inflammatory pathologies at an intestinal level and the preparation process of these compositions.

Abstract: Process for the synthesis of ZMS-5 zeolites essentially consisting of: a. preparing two aqueous solutions of sodium aluminate and silicate; b. putting the two solutions in contact with each other under stirring at room temperature; c. adding a solution of a mineral acid to solution (a) or to solution (b) or to solution (a)+(b), in such a quantity that the molar ratio OH?/H2O ranges from 0.02 to 0.03; d. adding a quantity of water sufficient for maintaining fluid the reacting mixture and the molar ratio OH?/H2O from 0.017 to 0.022; e. pre-heating the final mixture obtained at the end of steps (a)-(d) at a temperature ranging from 20 to 60° C.; and f. heating the mixture, under stirring, at a temperature ranging from 100 to 200° C.