[Clinical effects of 5-aminosalicylic acid preparations in Crohn disease].

The antiinflammatory drug 5-aminosalicylic acid is available either as mesalamine in various slightly different galenic preparations or as a prodrug with 5-ASA bound to a carrier molecule as inert as possible, which releases 5-ASA via bacterial degradation in the ileocolon. Data from therapeutic trials in patients with Crohn's disease are only available for mesalamine and sulfasalazine. In active Crohn's disease, high-dose (> 3 g per day) mesalamine only is more effective than placebo, but inferior to systemic steroids. They may be used in patients refusing treatment with classical steroids or not tolerating them if this does not make a case for budesonide. The therapeutic gain of mesalamine over placebo for the prevention recurrence in patients who have reached remission by drug treatment is marginal. Thus, its use in this clinical situation is not appealing. Results for the maintenance of a surgically induced remission appear slightly better so that the use of > 3 g of mesalamine per day may be still justified in this scenario. It is an unresolved question whether the clinical efficacy of different galenic mesalamine prepations in maintaining postoperative remission varies with the preoperative disease location. Present data are not sufficient to support differential drug treatment based on this parameter.