Ursodeoxycholic acid is an epimer of chenodeoxycholic acid. It is a bear bile acid discovered first in the endure and is apparently both a precursor or a fabricated from chenodeoxycholate. Its administration changes the composition of bile and could dissolve gallstones. It is used as a cholagogue and choleretic. The drug reduces cholesterol absorption and is used to dissolve (ldl cholesterol) gallstones in sufferers who need an replacement to surgical procedure.