Lactulose drinking too much may lead to diarrhea, the drug is the treatment of constipation and other diseases, no relevant indications are not recommended for use, intestinal obstruction and other conditions are prohibited. Lactulose can be converted into low molecular organic acids in the intestinal lumen, by increasing the concentration of solutes in the intestinal lumen and lowering the pH, it can realize the therapeutic purpose of treating constipation, lowering the ammonia compounds in the intestinal tract and treating hepatic encephalopathy. It is mainly used for the treatment of constipation, prevention and treatment of hepatic encephalopathy, etc. Overdose will lead to diarrhea, abdominal pain and other adverse reactions. It is contraindicated in cases of galactosemia, intestinal obstruction, acute abdomen of unknown origin, allergy to the components of the drug. The drug should not be used in conjunction with other laxatives; caution should be exercised in diabetes mellitus. The drug should be used under the supervision of a clinician, do not use the drug without authorization.