Depending on each person’s different constitution and sensitivity to the drug, the purpose of taking polyethylene glycol 4000 dispersion is different, and the time of bowel movement after drinking the drug is different. Polyethylene glycol 4000 is a mixture of ethylene oxide and water, which is used to fix water molecules through hydrogen bonding, retain water in the colon, increase stool water content and soften stool, restore stool volume and weight to normal, promote defecation and improve constipation symptoms, and is mainly used clinically for the treatment of constipation or bowel preparation before colonoscopy. It is mainly used in clinical practice for the treatment of constipation or bowel preparation before colonoscopy. The dose of polyethylene glycol 4000 is small for the treatment of constipation, and defecation can be started 24-48 hours after taking it in general. When it is used for intestinal preparation, the dose of medicine is large and a lot of water should be drunk at the same time. Generally, the bowel movement will start 2-4 hours after taking the medicine, until the bowel movement is clear and without obvious fecal matter, that is, the intestinal preparation is finished. Pay attention to scientific bowel habits in daily life, and it is recommended to have a reasonable diet and regular rest and recreation.