The medicine for constipation is lactulose, not lactose pectin. Lactulose has the characteristics of safety, effectiveness and little side effects. Lactulose oral solution is a hypertonic solution, which increases the osmotic pressure of intestinal contents after entering the colon, allowing water to enter the intestine from the intestinal lining, increasing the water content of feces, making the feces moist and soft, with a smooth surface and easy to discharge. Lactulose is hardly absorbed by the stomach and small intestine, and after reaching the colon, it is decomposed by the bacteria in the intestine to produce small molecule organic acids, which stimulates intestinal peristalsis and excretion of stools. Because of the gentle laxative effect of lactulose, it has less effect on intestinal electrolytes and pH, so it has less side effects and is safer to take for a long time, but because of the acid produced after decomposition, it can promote the growth of intestinal eosinophilic bacteria, so long-term use may occasionally lead to intestinal flora disorders. In addition to taking lactulose, patients with chronic constipation also need to eat more food containing dietary fiber, such as pumpkin, apple, konjac, whole wheat, etc., drink more water, and actively exercise, such as jogging, yoga, eight-danjin, etc. If taking regular doses of lactulose does not work, or if there is abdominal pain, diarrhea and blood in the stool in addition to constipation, you need to go to the hospital for further examination to determine whether there are intestinal polyps, intestinal tumors and other diseases, and to treat the cause.