When vomiting occurs when drinking laxatives for colonoscopy, consider changing to other laxatives and using warm water enemas if necessary. 1. Replacement of other medications: Because it is necessary to excrete the feces in the intestines when doing colonoscopy to see if there are any abnormal lesions. If the patient has a large reaction to the laxative, another laxative, such as mannitol, sodium phosphate and other drugs can be replaced. 2. Warm water enema: If the patient is still vomiting after changing medication, the medication should be stopped and a warm water enema can be taken as appropriate. Warm water can help soften the stool and lubricate the intestinal tract. After pouring warm water into the colon, it should be left for a period of time before defecation, which is conducive to discharging the feces in the colon out of the body. The patient should inform the doctor of the discomfort in time, so that other methods can be changed, otherwise it may cause adverse consequences or affect the examination results.