Miralax/Dulcolax Prep


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Bowel prep is done to clear the bowel of any solid matter. Its purpose is to prepare the bowel for the procedure. Please follow these instructions:

To Prepare:
• No supplemental iron for 7 days prior (the iron in a multivitamin is ok)

• If you are on a blood thinner, insulin or oral medications for diabetes please call the prescribing physician for special instructions.

You will need to purchase these over the counter items:
• 1 small box of DULCOLAX – 4 TABLETS (generic, bisacodyl.)

• One bottle of MIRALAX (8.3 oz/238 grams). The generic equivalent may be less expensive & is ok to use. 3 – 1 quart bottles of GATORADE or POWERADE.

Two days prior to colonoscopy:______________________________________
REGULAR DIET ALL DAY-but to avoid cramping, eat a light dinner.

Take 2 Dulcolax laxative tablets at bedtime. These should work overnight and cause you to have a bowel movement in the morning.

If you are unable to keep this appointment, call the office to cancel.

One day prior to colonoscopy:_______________________________________
You may have clear liquids only.

Avoid the colors red, purple, orange or blue. Please do not have any solid foods, dairy products, tomato or orange juice.

For the remainder of the day, stick to a clear liquid diet. Select from the options below.

  • Water
  • White Cranberry Juice
  • Beef/Chicken Broth
  • Gatorade
  • White Grape Juice
  • Jell‐O
  • Black Coffee
  • Italian Ice
  • Popsicle
  • Tea
  • Soft Drink (Cola is ok)
  • Sorbet

Mix seven (7) capfuls of Miralax in 1 ½ quarts (48oz) of Gatorade in a pitcher. Put in the refrigerator to chill. At 5:00pm drink 8 ounces every 15 minutes until gone. If you have any problems with vomiting the solution during the prep, please call our office at 513-751-6667.

Take 2 Dulcolax tablets at bedtime. Mix the rest of the Miralax with the remaining 1 ½ quarts (48oz) of Gatorade and refrigerate for use in the morning.

Day of the colonoscopy at: ___________________________________ Start:

Start to drink the rest of the Miralax/Gatorade solution. Drink 8 ounces every 15 minutes until it is gone. At the end of this prep your stool should be clear water, that is, there may be a yellow tinge in the water but there should be no solid matter. Please be sure to drink all the liquid. Nothing by mouth by ___________________.

Take your regular blood pressure medications the morning of the test. No oral diabetes medications the morning of the test.

If you are diabetic and on medication, consider bringing a supply with you to the exam as we will provide you with a beverage after the procedure.


  • Is there any way that I can make this taste better? You can try sucking on hard candy or rinse your mouth with water or a mouthwash.
  • Why avoid red liquids? The red color can persist in the colon and potentially look like blood.
  • One of the medications I was instructed to take the morning of my procedure is red. Can I take it? Medications should be taken the morning of your exam regardless of the color.
  • I feel like vomiting and do not think I can drink any more.  What should I do? It is important that you continue to drink the solution if possible.  Without a clean bowel, the doctor will not be able to thoroughly see inside of your colon to complete the examination. You can stop drinking for 30 minutes, then resume.  If you do vomit, wait 30-60 minutes then begin drinking the solution again.  If not improved, call us and have a phone number of an open pharmacy in case we need to call in a prescription.
  • I drank a lot of the solution and have not gone to the bathroom yet.  What should I do? Keep drinking and be patient.  Most people have a bowel movement after an hour; however, some patients may take several hours.
  • I am taking the prep and now having loose, watery stool.  Do I still need the rest of the prep? Yes, you may have solid stool higher in the colon that needs to be eliminated.
  • I already have diarrhea before taking the prep, do I still need to take the laxative? Yes, you must take the entire prep.  Your colon is approximately six feet long.  The entire colon must be emptied for your physician to see the colon clearly.
  • I see yellow color in the toilet bowl and a few flecks.  What do I do? If you drank the entire solution or if your last bowel movements were clear enough that you were able to see the bottom of the toilet, you should be fine.  It is okay if you have some flecks of material.  The yellow color is a result of bile that normally colors the feces.  This should not interfere with the examination.
  •  My bottom is sore.  What can I do? To clean the area, avoid rubbing.  Gently pat with a wet washcloth.  Apply a protective ointment such as Vaseline, Preparation H, Desitin or Aquaphor.
  • Can I drink alcoholic beverages? Alcoholic beverages can cause dehydration and some wines thin your blood.  Therefore, we strongly suggest that you do not drink any alcoholic beverages prior to your procedure.
  • Can I drink any nutritional supplements? You may drink Ensure or Boost (no red flavors) or Slim-Fast with Soy Protein/Lactose Free.  These drinks are water based, not milk based.
  • Can I chew gum or suck on candy? Yes, but nothing with soft centers or red color.
  • What if I am still passing stool the morning of the test? Take a tap water enema until you run clear.  If this does not work, please call the office.
  • Can I brush my teeth? Please do.  You may brush your teeth and rinse your mouth without swallowing.
  • Can I wear my dentures? Yes, you may wear dentures to the endoscopy suite.  However, if you are having an EGD as well as a colonoscopy, you may be asked to remove them prior to the procedure.
  • I have been instructed not to take anti-inflammatory drugs or blood thinners several days prior to the procedure.  What can I take for headaches and pain relief? You may take Tylenol (acetaminophen) as directed.
  • Can I have chicken soup? You can have broth; no noodles, chicken or vegetables are allowed.
  • Can I have the colonoscopy if I am on my period? Yes, the procedure can still be performed.  We ask that you use a tampon if possible but it’s not absolutely necessary.
  • Do I need a prescription for the laxatives? This prep is available over the counter without prescription or by prescription