After taking lactulose has been defecation is possible to stop the drug. Lactulose is a blood ammonia-lowering and diarrhea-inducing drug, which can stimulate intestinal peristalsis, keep the bowels open, relieve constipation, and also restore the physiological rhythm of the colon. Adverse reactions such as abdominal pain, bloating and diarrhea may occur after application, and it is contraindicated for galactosemia, intestinal obstruction and allergy. Generally after the application of lactulose defecation can stop using the drug, clinically lactulose although there is no organic damage side effects, but long-term use of the drug may lead to drug-dependent constipation, so constipation symptoms can be discontinued at any time after the improvement of the drug. The above drugs need to be applied under the guidance of a physician, and should not be used without authorization to avoid adverse reactions.