Preparation Instructions for Colonoscopy with Miralax


Prescription Medications: You may continue taking your normal medications/supplements (except blood thinners) until midnight the morning of your procedure. The morning of the procedure you may take only pain meds with a sip of water, no later than 2 hours before your procedure time. You will be home in time to take your morning meds after your procedure.

Diabetics: Test your blood sugar before you come in and bring the reading with you. For questions about your medications/insulin dosages, please contact the doctor who is monitoring your diabetes.

You should NOT plan on working, or driving, or watching small children, the entire day of your procedure, due to the sedation.

You must have someone to take you home after your procedure.

You will need:

  • Four (4) Dulcolax (Bisacodyl 5mg) pills (over the counter)
  • One (1) bottle Miralax 238gms or Polyethylene Glycol 3350 powder
  • 64 ounces of Gatorade, any sports drink, or Crystal Light (no red)
  • 10 ounce bottle of Magnesium Citrate
  • Baby wipes and Desitin or diaper cream (optional)

One week before your colonoscopy:

Do not take any blood thinners such as aspirin, ibuprofen, naproxen or any NSAIDS (many arthritis medications are NSAIDS).

Two days before your colonoscopy:

If you tend to be constipated, or sometimes need a laxative, take 2 tablespoons of Milk of Magnesia at 8 PM.

The day before your colonoscopy:

NO SOLID FOOD (including dairy products)

  • Clear liquids only all day (see list below).
  • Avoid anything red except cranberry juice.
  • Drink as much as you can, as clear liquids help with the prep.

At 4:00 PM:

  • Take four (4) Dulcolax tablets with any clear liquid.
  • Mix the Miralax in 64 ounces of Gatorade and dissolve.
  • Put mixture in the refrigerator (most patients think it’s easier to drink cold).

At 6:00 PM:

  1. Start to drink the Miralax.
  2. Drink one (1) cup every 10-15 minutes, until gone.
  3. If you get nauseated you can wait up to 45 minutes to take the next dose, as long as you finish in 2-3 hours (using a straw can help).
  4. Be prepared to use the facilities frequently.

If your bowel movements are not clear/yellow by 11:00 PM (or when you go to bed) drink a 10 ounce bottle of Magnesium Citrate unless you have any kidney or heart problems.


Nothing by mouth after midnight.


Clear liquids include:

  • Water
  • Sports drinks like Gatorade (no red)
  • Clear fruit juice (apple, white grape, or cranberry)
  • Popsicles (no sherbet or fruit bars)
  • Soft drinks (no red, yes you can have colas)
  • Clear broth or bouillon
  • Jello (no red)
  • Kool Aid or Crystal Light
  • Coffee or tea (no milk or creamer)
  • Hard candies (no red)

Come on the west side of the hospital, called Outpatient Surgery

Bring your insurance card and photo ID

750 West 800 North, Orem, Utah 84057