The generic name of Dumex is Lactulose Oral Solution, which is used for the treatment of chronic or habitual constipation, hepatic encephalopathy and so on. The main ingredient of Lactulose Oral Solution is Lactulose, which is used to regulate the physiological rhythm of the colon in cases of chronic or habitual constipation, and in cases of hepatic encephalopathy for the treatment and prevention of hepatic coma or precomatose state. The drug may cause the appearance of abdominal distension, and when the dose of the drug is higher than the recommended therapeutic dose, abdominal pain and diarrhea may occur. In addition, chronic high-dose users may develop electrolyte disorders due to diarrhea. In addition, the drug is contraindicated for those who are allergic to lactulose and its components, galactosemia, intestinal obstruction, acute abdominal pain, and to avoid concomitant use with other laxatives. Therefore, we must follow the doctor’s instructions to standardize the use of drugs, do not arbitrarily use the drug without authorization.