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8550 Datapoint Dr. Suite 200, San Antonio, TX

Gastroenterology Clinic of San Antonio

Half-Lytely Colonoscopy Prep

Ingest nothing 8 hours prior to your exam.


Follow the Colonoscopy Diet Instructions found here. The morning before your exam prepare the Half-Lytely prep per the instructions on the container and put in the refrigerator. You can have clear liquids all day but do not eat anything solid. The more fluids you drink the better. At about noon you will take the Bisacodyl tablets provided in the prep. At about 6pm began to drink the bowel prep at the rate of about a glass full every 10-15 minutes. Continue to do this until it is gone. You can continue to drink clear fluids after this to help push things through. The more fluids you drink the cleaner you will be. Continue this up until bedtime. Stop all oral intake 8 hours prior to your exam time to help assure your stomach is empty.


Ingest nothing 8 hours prior to your exam. Arrive at least 1 hour prior to your scheduled exam time.

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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