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  • Title: Efficacy and indications of ursodeoxycholic acid treatment for dissolving gallstones. A multicenter double-blind trial. Tokyo Cooperative Gallstone Study Group.
    Journal: Gastroenterology; 1980 Mar; 78(3):542-8. PubMed ID: 6985882.
    Abstract:
    The cholelitholytic action of ursodeoxycholic acid (UDCA) was investigated by a double-blind clinical trial. The trial started with 151 subjects all confirmed by radiographic examination as having radiolucent gallstones in a functioning gallbladder. The subjects were divided into three groups receiving 600 mg/day of UDCA, 150 mg/day of UDCA, and placebo (lactose) per day, respectively. Seventy-nine cases were classed as dropouts or were excluded due to incomplete follow-up or inadequate patient selection, and the data on the remaining 72 cases were analyzed. After 6--12 mo of treatment, dissolution of decrease in size or number of stones occurred in 10 of the 29 cases in the 600 mg/day group (34.5%), 4 of 23 cases in the 150 mg/day group (17.4%), and 1 of 20 cases in the control group (5.0%). For those cases with noncalcified, less than 15 mm in diameter, and floating stones, efficacy increased to 83.3% in the 600 mg/day group. Lithogenic index of bile defined by Thomas and Hofmann became unsaturated after treatment in the 600 mg/day group. Neither diarrhea nor hepatic toxicity was noted. The results indicate that UDCA is a safe and effective litholytic agent.
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