Dissolution of gallstones in patients w/ radiolucent, noncalcified, gallbladder stones <20 mm diameter in whom elective cholecystectomy would be undertaken except for presence of increased surgical risk due to systemic disease, advanced age, idiosyncratic reaction to general anesth, or for patients who refuse surgery. Prevention of gallstone formation in obese patients w/ rapid wt loss. Compensated primary biliary cirrhosis. Chronic cholestatic syndrome w/ various liver lesions.