“…The use of conventional drug delivery systems in IBD is limited, since they lead to systemic absorption of the drug, with related side effects and toxicity [4], such as osteoporosis and osteonecrosis, adrenal suppression, diabetes, cataract and glaucoma, as well as gastro-intestinal, cutaneous and cardiovascular complications [5]. As a consequence, several innovative drug delivery systems have been developed to achieve a selective drug delivery to the inflamed tissues [6][7][8][9]. With this aim, several approaches can be followed, i.e., the use of prodrugs becoming active after the hydrolysis by specific colon enzymes [10], bioadhesive delivery systems [11], timed-dependent delivery systems [12] and drug coating with pH dependent polymers [13,14].…”