Aman Singh, MD, Gastroenterolgy for Women logo for print
11525 Olde Cabin Rd, St. Louis, MO 63141
Phone: (314) 997-0554

Aman Singh, MD Gastroenterologist

Preparation using Suprep 2 Day Split Dose

The colon preparation is the most important step leading to the successful completion of a colonoscopy. We know it is inconvenient, but a clean colon will lead to an efficiently and safely performed colonoscopy that will lead to good gastrointestinal health

Seven Days Before the Procedure

Medication restrictions

  1. Diabetics taking insulin will need dose adjustment the day before the exam. Please ask for advice from the physician that prescribes your insulin. For diabetics only taking diabetic pills simply stop the pills the day before the procedure (see below).
  2. Blood thinners including Coumadin, aspirin, and Plavix type medicines. These can increase the risk of bleeding during endoscopic procedures to a varying degree. We recommend stopping Coumadin three days before the procedure, if possible. Please ask for advice from the physician that prescribes your Coumadin. If aspirin is used for preventative reasons and not for active cardiac or stroke prevention then it should be stopped for 7 days before the procedure. Discuss the use of other blood thinners, such as Plavix, with the prescribing physician.

Items to Purchase

  1. Fill the prescription for the Suprep.
  2. Fill the prescription for Tigan (anti-nausea) drug. 
  3. Any over-the-counter hemorrhoid ointment for anal discomfort (if needed).

Three Days Before the Procedure

No seeds, nuts, popcorn or peels from fruits and vegetables.

One Day Before the Procedure

  1. For breakfast and lunch you may choose one of the following:
    2 eggs or 1 yogurt (any kind), or 1 ensure
    then clear liquids only for the remainder of the day.
  2. You cannot have milk or orange juice for the entire day.
  3. Drink as much as you can to prevent dehydration. You may have bouillon, broth, black coffee (sugar is okay), tea, juice (apple, grape, cranberry), Gatorade, lemonade, soda, water, Popsicles and Jell-O (any flavor or color). Red Jell-O and red Gatorade may turn your bowel movements red, but should be limited.
  4. You may have clear candy (such as Lifesavers, Jolly Ranchers).
  5. Do not take oral diabetic pills.

Timing of Preparation

Evening Before the Colonoscopy

This is a 2 step process divided into two 16 ounce sessions. You must drink the entire Suprep to ensure your colon will be cleaned out. A poor prep can mean missed lesions (flat polyps) and cancellation and rescheduling of your procedure.

Starting at 6:00pm
  1. Pour ONE (1) 6 ounce bottle of Suprep into the supplied mixing cup; add cold drinking water to the 16 ounce fill line (red line) on the mixing cup.
  2. Stir contents. 
  3. Drink the entire cup of solution.
  4. Fill supplied mixing cup with an additional 16 ounce of water (to red line) and drink.
  5. If you become nauseated, stop drinking the SuPrep. Take one of the Tigan capsules. Resume drinking the SuPrep after 30 minutes, or when the nausea passes. If you do not use the Tigan, then it can be kept in case you have nausea in the future.

The Morning of the Procedure

Beginning 4-6 hours prior to scheduled procedure time, repeat steps 1-4 as above.

  1. You should take any necessary medications you normally use on the morning of the procedure with sips of water. Take nothing by mouth, including water, after completing the last Suprep dose.
  2. Take your regular medications on the morning of the procedure with sips of water.
  3. Arrive at your scheduled appointment time.
  4. Bring a list of your medications, insurance cards and photo ID. 
  5. After the procedure you must have a responsible adult drive you home. It is best if your driver waits for you at the endoscopy center. You may be dropped off and picked up by a responsible person approximately one and a half hours later. Taking a cab home is not an option.
  6. You may not drive or work until the next day. 

Important Information About Sedation

Sedatives used for endoscopy include Propofol. These medications provide amnesia and pain relief. You are breathing on your own. It is not considered general anesthesia. The only reasons not to receive Propofol are pregnancy, egg allergy and soy allergy.

Questions or Problems

  1. Daytime phone number is (314) 997-0554. 
  2. After hours number is (314) 388-6578. 
  3. Internet website address is

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