26 patients ( 20 females and 6 males , mean age 40.5 years +/- sem 2.20 , mean weight 60.2 kg +/- 1.98 ) with radiolucent gallstones of diameter less than or equal to 10 mm were treated for 6 months with ursodeoxycholic acid ( udca ) , a single dose of 600 mg at bedtime .
C0008350
gallstones
C0042105
ursodeoxycholic acid