Bowel preparation before surgery or colonoscopy is performed, and bowel movements usually begin 1-2 hours after taking the medication. If treating constipation, the time of defecation cannot be generalized due to different dosages of drugs taken. Electrolyte laxative, generally referred to as compound polyethylene glycol electrolyte bulk, is a compound preparation mainly used for the treatment of functional constipation, preoperative bowel preparation, bowel cleansing preparation before colonoscopy and other examinations. It should be started about 4-6 hours before the preoperative or bowel examination, in which the time for the drug to take effect is about 3 hours and the time for emptying is about 1 hour. It should be noted that gastrointestinal obstruction, intestinal perforation, gastrointestinal bleeding, gastric retention, Crohn’s disease, toxic megacolon, toxic enterocolitis, and those who are allergic to the product are prohibited; severe ulcerative colitis patients should be used with caution. Common adverse reactions include diarrhea, abdominal pain, nausea, vomiting, occasional stomach cramps and anal discomfort, and very rarely may be caused by allergic reactions such as urticaria and dermatitis. Compound Polyethylene Glycol Electrolyte Dispersion should be used under medical supervision.