When the laxative is too much to drink before the colonoscopy, it can be stopped if it has been excreted cleanly, and if it has not been excreted cleanly, it is necessary to improve the taste of the drug and replace it with enema to continue to assist in defecation. Before the colonoscopy, patients are required to follow the doctor’s instructions to do a good job of intestinal preparation, the most commonly used is to take laxatives to assist defecation, generally many times after the discharge of watery stools, indicating that the patient’s intestinal tract is better prepared. However, there are some groups who cannot take all the medications as prescribed by the doctor for various reasons. If they have already passed watery stools during this period, they can no longer continue to take the medication and further improve the colonoscopy examination; if the intestinal preparation is insufficient, it is necessary to improve the intestinal preparation as much as possible through different means. For example, if the taste of the medication is difficult to accept, some acceptable drinks can be added to the medication to help the use of the medication; if the medication still cannot be taken and colonoscopy is a necessary test, it can be replaced by an enema, so that the intestinal preparation can be done as well as possible, which will help the physician to carry out the operation.