Lactulose can promote defecation, make the intestinal tract acidic, long-term use may appear diarrhea, electrolyte disorders, not long-term use. Lactulose can inhibit intestinal absorption of water, stimulate gastrointestinal peristalsis to accelerate, make the intestinal tract more acidic, promote defecation and reduce the absorption of toxic substances. If the long-term use method is not appropriate, or abuse of the drug, diarrhea may occur, resulting in low potassium and other electrolyte disorders, can not be used for a long time. The drug can promote defecation and is commonly used to treat constipation and hepatic encephalopathy. Adverse effects of the drug include bloating, diarrhea, and abdominal pain. It is contraindicated for people who are allergic to lactulose, patients with intestinal obstruction, and people with fructose intolerance. Pregnant women as well as lactating women should use it under the supervision of a doctor after weighing the pros and cons. If there is no improvement in bowel movements after a few days of using the drug, you should consult a doctor. If long-term use of the drug is required, it should be used appropriately under the guidance of a doctor and electrolyte levels should be checked regularly.