Ursodeoxycholic acid is a dihydroxy bile acid with a rapidly expanding
spectrum of usage in acute and chronic liver diseases. The various me
chanisms of action of this hydrophilic bile acid include direct cytopr
otection, detergent action on dysfunctional microtubules, immunomodula
tion and induction of hypercholeresis. Its efficacy in primary biliary
cirrhosis and primary sclerosing cholangitis as an adjunct to medical
therapy has been well established. Newer indications include its use
in the management of chronic hepatitis, cirrhosis, post liver transpla
nt rejection, graft-versus-host disease and acute viral hepatitis, whe
re it not only relieves symptoms of cholestasis but also arrests ongoi
ng hepatocyte necrosis.