“…The side-effect profiles of mesalamine and balsalazide are similar to placebo, whereas olsalazine and sulfasalazine are associated with an increased incidence of treatment withdrawal due to adverse events. [3,4] Sulfasalazine commonly causes headache, rash, and nausea, which are doserelated and may be due to the sulfa moiety, whereas olsalazine may have a side effect of dose-related diarrhea. [3,4] Although reported and concerning, the risk for interstitial nephritis, pancreatitis, and other rare events is low for all of the aminosalicylates.…”