System for the colon delivery of drugs subject to enzyme degradation and/or poorly absorbed in the gastrointestinal tract

Said invention refers to a pharmaceutical form for selective colon delivery of drugs or bioactive molecules degraded and/or poorly absorbed in the gastrointestinal tract. The system comprises a core consisting of the active ingredient, and a protease inhibitor layer and/or an absorption enhancer layer, said core being separated from these layers by means of a polymer that swells and/or dissolves and/or is degraded when in contact with the biological fluids present in the gastro-intestinal tract; depending on the thickness of the polymeric layer, the release of the drug can be modulated with respect to the inhibitor and/or promoter.