Lactulose should not be taken for more than a few days at the longest there is no exact time, the patient’s physical condition is different from the time of use of the drug is also different. Lactulose belongs to the treatment of constipation commonly used drugs, belongs to the osmotic laxative, more suitable for the treatment of chronic or habitual constipation, can promote defecation, can also be used in the treatment of hepatic encephalopathy. But be careful not to use lactulose for a long time, if you take a large dose of lactulose for a long time, it may cause diarrhea and water electrolyte disorders. However, it is difficult to define the maximum number of days to take lactulose, if diarrhea, abdominal pain and other adverse reactions occur after the use of the drug, it should be judged by a doctor whether to reduce the dose of the drug or to stop the drug. If you need to use the drug, it is recommended to use the drug under the guidance of a doctor, not blindly self-medication to avoid adverse effects.