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8550 Datapoint Dr. Suite 200, San Antonio, TX

Gastroenterology Clinic of San Antonio

Nulytely Colonoscopy Prep

4L NuLYTELY bowel prep (prescription)
Small box dulcolax tablets (no prescription)


Follow the Colonoscopy Diet Instructions available here. This is very important and will help assure a clean prep and thorough exam. You will begin a liquid diet 24 hours before your procedure.

Part 1. Mix the NuLYTELY powder in the provided 4 liter container and place in the refrigerator to chill. You can add flavor pack or Crystal Light (not red or purple) for flavor. At noon take both (2) the dulcolax tablets. Then starting about 6pm start drinking the bowel prep at the rate of about one 8 oz glass every 15 minutes until half the liquid is gone. Save the other half for the morning of your procedure. Splitting the bowel prep up like this does a better job of cleaning the colon than taking it all at once. You can continue to drink clear liquids until you go to bed.

Part 2. Starting 10 hours before your procedure drink the second half of the bowel prep you saved from the day before. Finish it over about 1-2 hours. You can drink clear liquids of your choice up to 8 hours before your procedure but must finish all bowel prep and oral intake by 8 hours before your procedure.

If your procedure is scheduled for real early in the morning (6-8am) you may find it more convenient to just drink the whole 4 liter container of NuLYTELY the night before instead of trying to split it into two doses.


Arrive at the endoscopy center one hour prior to your appointment with ONLY your driver’s license, insurance card and someone to drive you home. You will NOT be allowed to drive yourself home due to the sedation. You must bring your friend or relative with you to your appointment. You ARE NOT allowed to go home by taxi or BUS. If this is not followed then your procedure will be canceled and rescheduled and could be subjected to a fee. All personal items need to remain at home, you will not need your purse or wallet or jewelry during your colonoscopy.

The endoscopy center will be calling you to get medical history from you over the phone. The center is not in the same office as your doctor, so please be aware that the medical staff for the endoscopy center may call you.

Please let us know if you have any questions- we want your experience to be as safe as possible.

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