Bowel Prep
Preparing for a colonoscopy is very important to ensure the procedure is successful.
Proper preparation involves cleansing the bowel thoroughly, which may also be necessary for other procedures such a virtual colonoscopy or gastrointestinal X-ray. If your bowel is not thoroughly cleaned out, the test may need to be repeated.
Types of bowel prep
Two main types of laxatives are used to prepare the bowel for a colonoscopy:
Polymer-based formulas (such as PEGlyte or GOLytely): These come as a powder that mixes with water. They are effective and gentle on the inner lining of your bowel, but require you to drink large volumes of liquid and may lead to dehydration.
Saline-based formulas (such as Pico-Salax): You can swallow these laxatives with less volume of liquid, making them easier for some people to take. However, they may irritate the inner lining of the bowel and may not be suitable for everyone.
Your physician will provide you with specific instructions on which prep to use based on your needs.
How to prepare for a colonoscopy
One week before the test
- Pick up the prescription for your bowel prep from a pharmacy.
- Start following a low-fibre diet three or four days before your colonoscopy.
- Follow any instructions you have been given about changes to any medication that you take.
One day before the test
- Eat a regular breakfast.
- Have only clear liquids such as broth, black coffee or tea, strained juice or Jell-O up to six hours before your colonoscopy.
- Follow the instructions regarding when and how to start taking your bowel prep laxatives The exact instructions will depend on what type of prep you are using and your scheduled colonoscopy time.
- Give yourself ample time for your bowels to clear.
The day of the test
- Do not eat anything.
- You can drink clear liquids up to three hours before the colonoscopy.
- Dress comfortably in loose-fitting clothes.
- Bring someone to help you get home, as the sedation may impair your ability to travel safely.