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|ATC code||A05AA02 (WHO)|
|Synonyms||ursodeoxycholic acid, Actigall, Ursosan, Urso, Urso Forte|
|PDB ligand ID||IU5 (PDBe, RCSB PDB)|
|Chemical and physical data|
|Molar mass||392.56 g/mol|
|3D model (Jmol)||Interactive image|
|Melting point||203 °C (397 °F)|
Ursodeoxycholic acid (INN, BAN and AAN), also known as ursodiol (USAN) and the abbreviation UDCA, from the root-word for bear urso, as bear bile contains the substance, is one of the secondary bile acids, which are metabolic byproducts of intestinal bacteria.
Primary bile acids are produced by the liver and stored in the gall bladder. When secreted into the intestine, primary bile acids can be metabolized into secondary bile acids by intestinal bacteria. Primary and secondary bile acids help the body digest fats. Ursodeoxycholic acid helps regulate cholesterol by reducing the rate at which the intestine absorbs cholesterol molecules while breaking up micelles containing cholesterol. Because of this property, ursodeoxycholic acid is used to treat (cholesterol) gallstones non-surgically. It is also used to relieve itching in pregnancy for some women who suffer obstetric cholestasis.
While some bile acids are known to be colon tumor promoters (e.g. deoxycholic acid), others such as ursodeoxycholic acid are thought to be chemopreventive, perhaps by inducing cellular differentiation and/or cellular senescence in colon epithelial cells.
Ursodeoxycholic acid has also been shown experimentally to suppress immune response such as immune cell phagocytosis. Prolonged exposure and/or increased quantities of systemic (throughout the body, not just in the digestive system) ursodeoxycholic acid can be toxic.
An incomplete list of the current uses is as follows:
- Reduction in gallstone formation, either in patients with gallstones unfit for cholecystectomy, or obese patients undergoing rapid weight loss to prevent gallstone formation.
- For the treatment of primary biliary cholangitis.
- To aim to improve bile flow in patients with cystic fibrosis (controversial)
- In newborn infants with impaired bile flow
A Cochrane review looking at primary biliary cirrhosis found that although ursodeoxycholic acid showed a reduction in liver biochemistry, jaundice, and ascites, it did not decrease mortality or liver transplantation.[needs update] Ursodiol is the only FDA approved drug to treat primary biliary cirrhosis (PBC).
Ursodiol may be used for biliary stasis in pregnant women to relieve the symptoms of itching and decrease bile absorption.
In children, ursodeoxycholic acid use is not licensed, as its safety and effectiveness have not been established. Evidence is accumulating that ursodeoxycholic acid is ineffective and unsafe in neonatal hepatitis and neonatal cholestasis.
There is insufficient evidence to justify routine use of ursodeoxycholic acid in cystic fibrosis, especially that available data for analysis of long-term outcomes such as death or need for liver transplantation is lacking.
In double the recommended daily dose ursodeoxycholic acid reduces elevated liver enzyme levels in those with primary sclerosing cholangitis, but its use was associated with an increased risk of serious adverse events (the development of cirrhosis, varices, death or liver transplantation) in patients who received ursodeoxycholic acid compared with those who received placebo. Serious adverse events, were more common in the ursodeoxycholic acid group than the placebo group. The risk was 2.1 times greater for death, transplantation, or minimal listing criteria in patients on ursodeoxycholic acid than for those on placebo.
It is concluded that ursodeoxycholic acid use is associated with improved serum liver tests that do not always correlate with improved liver disease status. WHO Drug Information advises against its use in primary sclerosing cholangitis in unapproved doses beyond 13–15 mg/kg/day.
Mechanism of action
The drug reduces cholesterol absorption and is used to dissolve (cholesterol) gallstones in patients who want an alternative to surgery. If the patient stops taking the drug the gallstones tend to recur if the condition that gave rise to their formation does not change. For these reasons, it has not supplanted surgical treatment by cholecystectomy.
Also used to relieve itching in intrahepatic cholestasis of pregnancy (naltrexone may also be used).
Ursodeoxycholic acid can be chemically synthesized and is marketed under multiple trade names, including Actigall, BILIVER, Coric, Deursil, Egyurso, Udiliv, UDOXYL, Urso, Urso Forte, Ursocol, Ursofalk, Ursosan, Ursoserinox,Udimarin(India) and Stener in Bangladesh.
- Akare S, Jean-Louis S, Chen W, Wood DJ, Powell AA, Martinez JD (December 2006). "Ursodeoxycholic acid modulates histone acetylation and induces differentiation and senescence". International Journal of Cancer. Journal International Du Cancer. 119 (12): 2958–69. doi:10.1002/ijc.22231. PMID 17019713.
- Amaral JD, Viana RJ, Ramalho RM, Steer CJ, Rodrigues CM (September 2009). "Bile acids: regulation of apoptosis by ursodeoxycholic acid". Journal of Lipid Research. 50 (9): 1721–34. doi:10.1194/jlr.R900011-JLR200. PMC . PMID 19417220.
- Material Safety Data Sheet on Ursodiol MSDS. https://fscimage.fishersci.com/msds/70916.htm
- Gong Y, Huang ZB, Christensen E, Gluud C (2008). Gong Y, ed. "Ursodeoxycholic acid for primary biliary cirrhosis". Cochrane Database of Systematic Reviews (3): CD000551. doi:10.1002/14651858.CD000551.pub2. PMID 18677775.
- Jackson H, Solaymani-Dodaran M, Card TR, Aithal GP, Logan R, West J (October 2007). "Influence of ursodeoxycholic acid on the mortality and malignancy associated with primary biliary cirrhosis: a population-based cohort study". Hepatology. 46 (4): 1131–7. doi:10.1002/hep.21795. PMID 17685473.
- Mayo Clinic Staff. "Cholestasis of pregnancy: Treatment and Drugs". Mayo Clinic.
- Kotb MA (July 2008). "Review of historical cohort: ursodeoxycholic acid in extrahepatic biliary atresia". Journal of Pediatric Surgery. 43 (7): 1321–7. doi:10.1016/j.jpedsurg.2007.11.043. PMID 18639689.
- Paediatric Formulary Committee (2008). British National Formulary for Children 2008. London: Pharmaceutical Press. p. 91. ISBN 0-85369-780-9.
- Urso package insert. Birmingham, AL: Axcan Pharma U.S.; 2000 Jan.http://www.axcan.com/pdf/urso_patient_brochure.pdf
- Cheng K, Ashby D, Smyth RL. Ursodeoxycholic acid for cystic fibrosis-related liver disease. Cochrane Database Syst Rev. 2014 Dec 15;12:CD000222. doi:10.1002/14651858.CD000222.pub3 PubMed PMID 25501301.
- Lindor KD, Kowdley KV, Luketic VA, et al. (September 2009). "High-dose ursodeoxycholic acid for the treatment of primary sclerosing cholangitis". Hepatology. 50 (3): 808–14. doi:10.1002/hep.23082. PMC . PMID 19585548.
- Public Assessment Report for paediatric studies submitted in accordance with Article 45 of Regulation (EC) No1901/2006, as amended http://www.google.com.eg/search?q=public+MAH+UDCA&hl=en-EG&gbv=2&oq=&gs_l=
- PUBLIC ASSESSMENT REPORT of the Medicines Evaluation Board in the Netherlands http://mri.medagencies.org/download/NL_H_2516_001_PAR.pdf