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Mesalazine (INN, BAN), also known as mesalamine (USAN) or 5-aminosalicylic acid (5-ASA), is an anti-inflammatory drug used to treat inflammatory bowel disease, such as ulcerative colitis and mild-to-moderate Crohn's disease.〔 〕 Mesalazine is a bowel-specific aminosalicylate drug that acts locally in the gut and has its predominant actions there, thereby having few systemic side effects.〔("mesalazine" ). PharmGKB.〕 As a derivative of salicylic acid, mesalazine is also thought to be an antioxidant that traps free radicals, which are potentially damaging byproducts of metabolism.〔 Mesalazine is the active moiety of sulfasalazine, which is metabolized to sulfapyridine and mesalazine.〔''Lippencott's Illustrated Reviews: Pharmacology'', 4th Ed. Finkel, Cubeddu and Clark〕 Mesalazine is the active component of the prodrug balsalazide along with the inert carrier molecule 4-aminobenzoyl-beta-alanine.〔Drugs & Therapy Properties 2003 Oct; Vol 19, No. 10〕 ==Side effects== Commonly: * Diarrhea * Nausea * Cramping * Flatulence Uncommonly: * Headache * Exacerbation of the colitis * Hypersensitivity reactions (including rash, urticaria aka hives, interstitial nephritis and lupus erythematosus-like syndrome) * Hair loss Rarely: * Acute pancreatitis * Hepatitis * Nephrotic syndrome * Blood disorders (including agranulocytosis, aplastic anaemia, leukopenia, neutropenia, thrombocytopenia) * Fever 〔(【引用サイトリンク】 url=http://onlinelibrary.wiley.com/doi/10.1034/j.1398-9995.1999.00298.x/full )〕 Mesalazine avoids the sulfonamide side effects of sulfasalazine (which contains additional sulfapyridine), but carries additional rare risks of: * Allergic lung reactions * Allergic myocarditis * Methaemoglobinaemia 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mesalazine」の詳細全文を読む スポンサード リンク
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