Product Name

Balsalazide Disodium

CAS Number


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Product Name:
Balsalazide Disodium
CAS Number:
For the treatment of mildly to moderately active ulcerative colitis.
Mode of Action:

The mechanism of action of 5-aminosalicylic acid is unknown, but appears exert its anti-inflammatory effects locally (in the GI tract) rather than systemically. Mucosal production of arachidonic acid metabolites, both through the cyclooxygenase pathways (catalyzes the formation of prostaglandin precursors from arachidonic acid), and through the lipoxygenase pathways (catalyzes the formation of leukotrienes and hydroxyeicosatetraenoic acids from arachidonic acid and its metabolites), is increased in patients with chronic inflammatory bowel disease. Therefore, it is possible that 5-aminosalicylic acid diminishes inflammation by blocking production of arachidonic acid metabolites in the colon through both the inhibition of cyclooxygenase and lipoxygenase.


Balsalazide is a prodrug that has little or no pharmacologic activity until it is enzymatically cleaved in the colon to produce mesalamine (5-aminosalicylic acid), an anti inflammatory drug indicated for the treatment of mildly to moderately active ulcerative colitis. Balsalazide disodium is delivered intact to the colon where it is cleaved by bacterial azoreduction to release equimolar quantities of mesalamine, which is the therapeutically active portion of the molecule, and the intert 4-aminobenzoyl-(beta)-alanine. As a result, the spectrum of pharmacologic activity of balsalazide is similar to that of mesalamine.


Cleaved in the colon via bacterial azoreduction to 5–aminosalicylic acid (5–ASA) and 4–aminobenzoyl-beta-alanine, the inactive carrier moiety.


A single oral dose of balsalazide disodium at 5 grams/kg or 4-aminobenzoyl-(beta)-alanine, a metabolite of balsalazide disodium, at 1 gram/kg was non-lethal in mice and rats. No symptoms of acute toxicity were seen at these doses.

Benzoic acid, 5-((1E)-(4-(((2-carboxyethyl)amino)carbonyl)phenyl)azo)-2-hydroxy-, disodium salt, dihydrate
Molecular Mass:
2-Carboxyethyl)carbamoyl)phenyl)azo)salicylic acid, disodium salt, dihydrate, Balsalazide disodium, Balsalazide disodium hydrate, Benzoic acid, 5-((4-(((2-carboxyethyl)amino)carbonyl)phenyl)azo)-2-hydroxy-, disodium salt, dihydrate, (E)-, BX661A, Colazal, UNII-1XL6BJI034
General Reference:
General Reference:

  1. Wiggins JB, Rajapakse R: Balsalazide: a novel 5-aminosalicylate prodrug for the treatment of active ulcerative colitis. Expert Opin Drug Metab Toxicol. 2009 Oct;5(10):1279-84. Pubmed
  2. Ragunath K, Williams JG: Review article: balsalazide therapy in ulcerative colitis. Aliment Pharmacol Ther. 2001 Oct;15(10):1549-54. Pubmed

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