<prompt> Medical therapy can be tried in gallstone patients with:Contracted and small non functioning gallbladderRadiolucent gallstonesGallstones of size 30 mm in diameterGallstone pancreatitis  <response>: Ursodeoxycholic acid UDCA decreases cholesterol saturation of bile. In carefully selected patients with functioning gallbladder and with radiolucent stones 10 mm in diameter, complete dissolution with UDCA can be achieved in 50 of patients within 6 months to 2 years. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 2621 