“…Additional information regarding thiopurines has been published, including the use of metabolite testing and duration of therapy for these drugs [19,20]. 5-aminosalicylic acids (5-ASAs), a number of oral 5-ASA agents are commercially available, including azo-bond pro-drugs such as sulfasalazine, olsalazine and balsalazide, and delayed-and controlled-release forms of mesalazine [12,21,22]. The effectiveness of oral therapy relies on good compliance, which may be adversely affected by frequent daily dosing and a large number of tablets.…”