You need to drink Lactulose Oral Liquid for bowel cleansing preparation before doing colonoscopy, and it is recommended to take it one day before colonoscopy, at least 2~3 times until the stool is discharged. Lactulose oral solution can effectively adjust the rhythmicity of gastrointestinal peristalsis, so it has a good therapeutic effect on chronic constipation as well as habitual constipation, which is conducive to the discharge of stool in constipated patients. When lactulose is used in the treatment of hepatic encephalopathy, it is mainly used to promote the growth of intestinal acidophilus and improve the metabolism of bacteria, thus playing the role of diarrhea. Lactulose is virtually non-toxic, after oral intake may have abdominal distension, abdominal discomfort, diarrhea and dehydration occurred in too large a dose. It will disappear automatically soon after adjusting the dose. Lactulose oral solution contains some amount of galactose, so it is contraindicated in patients with galactosemia (galactose-1-phosphate uridyltransferase deficiency). Enteroscopy is able to observe the internal structure of the intestines, and there are certain lesions that develop that can also be informed by this examination, and it is also currently a more effective method of screening for intestinal malignant tumors. Excretions may interfere with the results of the examination, so it is important to keep the intestinal tract clean to facilitate the observation of the internal structure of the intestinal tract. Please use the medication under the guidance of your doctor.