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Mesalazine, also known as mesalamine or 5-aminosalicylic acid (5-ASA), is a medication used to treat inflammatory bowel disease, including ulcerative colitis and Crohn's disease.[1] It is generally used for mildly to moderately severe disease.[1] It is taken by mouth or rectally.[1] The formulations which are taken by mouth appear to be similarly effective.[4] Common side effects include headache, nausea, abdominal pain, and feve... [wikipedia]