No bowel movement for a week after taking Lactulose may be caused by indigestion, low diet and insufficient dosage. If the patient is accompanied by uncomfortable symptoms, it is recommended to go to the hospital in time for relevant examinations, according to the cause of the relevant treatment. 1. Indigestion: due to the patient’s gastrointestinal indigestion, resulting in eating food can not be digested properly, accumulating in the stomach and intestines, and lactulose is to stimulate gastrointestinal peristalsis, which helps people defecate, but can not solve the problem of indigestion, so after taking lactulose a week can not be discharged stools. 2. Low diet: due to the patient’s long-term diet is too small, will lead to the patient’s intestinal non-absorbable residue amount is small, when the stool is not enough, it is difficult to be intestinal transportation out of the body, in time to take lactulose is not a way to help the body to increase the volume of the stool, so there is a lactulose after a week of the phenomenon of no bowel movement. 3. Insufficient dosage: patients with severe constipation, the phenomenon of prolonged absence of defecation, because the long-term accumulation of stool in the intestine, the intestinal tract will keep sucking up the water of the stool, so that the stool is very hard and difficult to discharge. And there is not enough lactulose intake to play the role of softening the stool, so there will still be a week without bowel movement. If patients have uncomfortable symptoms after taking Lactulose, it is recommended to go to the hospital in time and take appropriate treatment measures under the guidance of the doctor.