Ursodeoxycholic acid can be used mainly for the treatment of hepatobiliary diseases, and the side effects of this drug are mainly manifested in the following aspects: 1. Gastrointestinal disorders may occur, such as dilute stools and diarrhea may occur during the treatment process, and pain in the right upper abdomen may also occur. 2. Liver and biliary functions of patients may be affected, such as calcification of gallstones may occur during the treatment. 3. Individual patients may experience allergies such as hives. When using this drug, it should be noted that it must be used under the guidance of a doctor, and attention should be paid to monitoring liver function during the treatment. In addition to this, the condition of gallstones should also be closely monitored, especially when applied to dissolve cholesterol stones. In conclusion, the side effects of ursodeoxycholic acid are more commonly manifested in the gastrointestinal tract or in the hepatobiliary system.