MoviPrep (polyethylene glycol electrolyte solution) is a laxative solution that increases the amount of water in the intestinal tract to stimulate bowel movements. This medication also contains potassium, sodium, and other minerals to replace electrolytes that are passed from the body in the stool. MoviPrep is used to clean the bowel before colonoscopy, a barium x-ray, or other intestinal procedures. MoviPrep may also be used for purposes not listed in this medication guide.