In general, the best quality preps involve taking some laxative at night and some in the morning (split-dose prep). There are also preps where the amount of laxative you drink is far less compared to other options (low-volume bowel prep).

Some doctors allow patients to eat a low-residue diet in combination with over-the-counter laxatives the day before. Some insist on prescription preps because they are far superior when it comes to cleaning out the colon and getting a good view. It really depends on what you and your doctor agree on what’s best.

If you’re unsure about what’s best for you, ask your doctor for options or ask other patients. Choose the prep that’s best for you. And, if you get to prep night and cannot complete the prescribed prep, call your doctor right away. A completed prep is most important, and they can offer you another option to get you fully cleaned out.