Balsalazide

Balsalazide
Clinical data
Trade names	Colazal, Giazo
AHFS/Drugs.com	Monograph
MedlinePlus	a699052
License data	US DailyMed: by mouth;
Pregnancy; category	AU: C; ;
Routes of; administration	By mouth
ATC code	A07EC04 (WHO) ;
Legal status
Legal status	AU: S4 (Prescription only); UK: POM (Prescription only); US: ℞-only;
Pharmacokinetic data
Bioavailability	<1%
Protein binding	≥99%
Elimination half-life	12hr
Identifiers
	IUPAC name (E)-5-{[4-(2-carboxyethylcarbamoyl)phenyl]diazenyl}-2-hydroxybenzoic acid;
CAS Number	80573-04-2 ;
PubChem CID	5362070;
DrugBank	DB01014 ;
ChemSpider	10662422 ;
UNII	P80AL8J7ZP;
KEGG	D07488; as salt: D02715;
ChEBI	CHEBI:267413 ;
ChEMBL	ChEMBL1201346 ;
CompTox Dashboard (EPA)	DTXSID7040653 ;
ECHA InfoCard	100.117.186
Chemical and physical data
Formula	C17H15N3O6
Molar mass	357.322 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES O=C(O)c1cc(ccc1O)/N=N/c2ccc(cc2)C(=O)NCCC(O)=O;
	InChI InChI=1S/C17H15N3O6/c21-14-6-5-12(9-13(14)17(25)26)20-19-11-3-1-10(2-4-11)16(24)18-8-7-15(22)23/h1-6,9,21H,7-8H2,(H,18,24)(H,22,23)(H,25,26)/b20-19+ ; Key:IPOKCKJONYRRHP-FMQUCBEESA-N ;
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Balsalazide is an anti-inflammatory drug used in the treatment of inflammatory bowel disease. It is sold under the brand names Giazo, Colazal in the US and Colazide in the UK. It is also sold in generic form in the US by several generic manufacturers.

It is usually administered as the disodium salt. Balsalazide is a prodrug of mesalazine, also known as 5-aminosalicylic acid, or 5-ASA. The advantage of balsalazide over mesalazine in the treatment of ulcerative colitis is believed to be due to balsalazide not being metabolized in the small intestine; it can thus reach the large intestine intact, where it is then metabolized to mesalazine. It is in the category of disease-modifying antirheumatic drugs (DMARDs) family of medications. It is unclear exactly how it works.