a double-blind clinical trial comparing ursodesoxycholic acid and chenodesoxycholic acid in patients with cholesterol stones in the gall-bladder showed that ursodesoxycholic acid was superior to the older drug not so much in percentage of biliary calculi dissolved but in dosage reduction ( 50 % ) and improved clinical and biological tolerance .
C0042105
ursodesoxycholic acid
C0008350
biliary calculi