Colon-cleansing medications are used to prepare for a colonoscopy, treat constipation, and clean the bowel out before surgery. These medications also have other uses, such as treating certain digestive conditions. They work by drawing water into the colon to soften stool and stimulate bowel movements. Common classes include osmotic laxatives and stimulant laxatives, which are taken orally. Osmotic laxatives include polyethylene glycol 3350/electrolytes (Golytely, Moviprep, Nulytely). Stimulant laxatives include sodium/potassium/magnesium sulfate (Suprep Bowel Prep Kit) and sodium Sutab (sulfate/magnesium sulfate/potassium chloride).