Ursodiol, also known as also known as ursodeoxycholic acid (UDCA), is a prescription medication used to dissolve cholesterol gallstones in an attempt to avoid surgery, and prevent gallstones in patients who are rapidly losing weight. It is also used to treat patients with primary biliary cirrhosis (PBC), an autoimmune disease which can damage your liver.
Ursodiol is also available under the brand names Actigall and Urso, and comes in both capsule and tablet form.