After drinking the colonoscopy medicine there is still fecal sludge, indicating that the bowel cleansing is not thorough enough, and need to be remedied in time, such as the use of compounded polyethylene glycol electrolytes, saline cleansing enema, or delay the time of the colonoscopy examination. Enteroscopy is commonly used in gastroenterology as a means of checking intestinal diseases, enteroscopy before need to follow the doctor’s instructions to take intestinal cleansing drugs, usually the night before the examination began to take, take the need to drink a lot of drinking water until the stool is clear water-like. If you drink the colonoscopy medicine and find that there is still fecal residue in the stool before the examination, and it is not completely watery, it means that the intestinal cleansing is not thorough enough, and you need to remedy the situation in a timely manner. 1. If there is still enough time before the examination, you can take additional colonoscopy medicine again, such as compound polyethylene glycol electrolytes for bowel cleansing. 2. If there is less time before the examination, saline cleansing enema can be considered. 3. If there is no time to take either of the above remedies, the colonoscopy needs to be postponed and a new suitable time chosen. If the bowel cleansing is not complete, colonoscopy is not recommended. Therefore, bowel preparation should always be performed as prescribed by the doctor before colonoscopy.