Not constipated drinking lactulose has the effect of causing diarrhea in patients. Lactulose oral solution is a western medicine, the main ingredient is lactulose, into the human intestinal tract can be converted into organic acids in the colon, there is a change in the pH value in the intestinal tract, reduce water reabsorption, and promote intestinal peristalsis, in addition to cirrhosis of the liver patients can be used to treat and prevent hepatic encephalopathy. Therefore people who are not constipated take the drug has the effect of causing diarrhea. Lactulose oral solution common adverse reactions for abdominal pain; suffering from acute inflammatory bowel disease, diabetes mellitus, galactosemia and other patients are prohibited; the use of the drug during the use of other diarrhea-inducing drugs can not be used at the same time. If the patient has the need to use the drug, must be under the guidance of a professional physician, so as not to blindly use the drug, resulting in adverse consequences.