Drinking purgatives nausea and vomiting, if the amount of vomiting is not too much, the bowel movement can be up to the watery or yellowish watery stool, you can do a colonoscopy. If the amount of vomiting is large and the bowel movement is not clean, then the colonoscopy cannot be done directly. The premise of the colonoscopy is to do a good job of intestinal preparation, i.e., intestinal cleansing, generally need to start taking laxatives one day before the examination, you can choose to compound polyethylene glycol powder, and with appropriate exercise, can effectively promote intestinal peristalsis, as far as possible to excrete clean. Generally need the patient to discharge to clear water-like stools before the colonoscopy examination. Some of the drug users take bowel cleansing drugs after nausea, vomiting, can be added in the laxative lighter color juice, slow down the speed of medication, family encouragement and other methods, to a certain extent, to assist the patient better use of medication, and ultimately to obtain satisfactory bowel cleansing effect. If the patient is still unable to cooperate, enema can be chosen to make the intestinal tract clean and then enteroscopy, specific can consult a professional physician’s opinion.