
your procedure guide | colonoscopy (half-lytely)
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Colonoscopy with Half-Lytely Preparation
We would like to take this opportunity to thank you for choosing the Atherton Endoscopy Center. Our goal is to provide you with the highest quality of care in a friendly environment. We always welcome your feedback regarding your experience at our facility.
About the Procedure
Your doctor has recommended that you have a colonoscopy. A colonoscopy is a test that allows your doctor to examine the lining of your colon for any abnormalities. The colonoscope, which is a thin, flexible, fiber optic instrument, is passed from your rectum to your cecum (the end of your colon). Colonoscopy is considered the “gold standard” for colon cancer prevention. It is also possible to evaluate for intestinal inflammation, ulceration, bleeding, diverticulosis and tumors in this manner. It is possible to remove most colon polyps during a colonoscopy; there is no pain or any sensation as the polyp is removed. A colonoscopy is a safe and highly effective procedure. The procedure is quick (usually between 20 – 40 minutes) and generally quite painless. You will be given sedation to make you relaxed and sleepy. Usually patients remember very little, and are pleasantly surprised by how easy the procedure was.
Five Days before the Procedure:
Please discontinue any of the following medications :
- Blood thinning medications – such as Coumadin, Plavix, Ticlid, Aspirin, Ibuprofen (Advil, Motrin, Excedrin IB), Naproxen (Naprosyn, Anaprox, Aleve). Please discuss stopping these medications with your doctor.
- Anti-arthritis medications (Voltaren, Lodine, Indocin, Orudis, Daypro, Feldene)
It is fine to take Acetaminophen (Tylenol).
Please avoid foods with many small seeds and foods that contain the artificial fat ‘Olestra’ prior to your procedure. They can clog our scopes.
Two Days Prior To Your Procedure
- Pick up your prescription of Half-lytely at the pharmacy. Add water to the bottle as directed on the label and refrigerate overnight.
One of our nurses will be contacting you two days prior to your procedure to obtain your medical history and review your preparation instructions. We will be happy to answer any questions you may have at that time. Please make sure you tell the nurse if you have any of the following:
- Allergies to any medications or latex products
- Heart problems or related surgeries, Heart valve replacement
- Joint replacement
- A tendency to bleed during surgical or dental procedures
- Sleep apnea or breathing difficulties
- Kidney problems
The nurse will ask you about the medications you take. Please let her/him know if you are taking, or have recently taken, any of the following medications:
- Blood thinning medications – as above
- Anti-arthritis medications – as above
- Anti-seizure medications
- Chemotherapy treatments
- Iron
- Diabetes medications such as Insulin or oral diabetes medications
- Herbal remedies
If you are taking medications for your heart, lungs or blood pressure the nurse will let you know if you should take them in the morning with sips of water.
The Day Before Your Procedure
Half-lytely Preparation
You may only have clear liquids all day, no solid foods. It is very important that you drink frequently throughout the day to avoid dehydration and to enhance the laxative response.
Acceptable clear liquids include:
- Water
- Gatorade or other sports drink
- Apple juice, white grape or white cranberry juice
- Chicken, Beef or Vegetable broth
- Jello (No red or purple colors)
- Popsicles (No red or purple colors)
- Coffee or Tea (No milk; sugar is fine)
- Soda Pop
At Approximately 3 PM
Take both bisacodyl tablets (inside the half-lytely prep kit) with an 8 ounce glass of water. Swallow them whole, do not crush or chew. You may begin experiencing bowel movements 1 to 6 hours after taking the tablets.
At approximately 7PM
Begin drinking the Half-lytely. You will need to drink an 8 ounce glass every 15 minutes. It will take you about 1-2 hours to drink the entire 2 liters. If you feel nauseous it may help to suck on a lemon or lime wedge in between glasses.
It is important to drink a lot of clear liquids, especially after you finish the preparation and before bedtime.
If you are not able to tolerate the prep (if you vomit) or if you feel like the preparation has not adequately cleaned out your intestine, please call your doctor (even after hours). It is very important that your colon is sufficiently clean so that we can get a good look at the lining and make sure there are no polyps or abnormalities.
Individual responses to laxatives can vary. The prep will cause multiple bowel movements. It often works within 30 minutes, but may take up to several hours.
Many patients find it helpful to have some baby wipes and hemorrhoid cream on hand to soothe their sore bottoms!
The Day of Your Procedure
For an AM procedure time: Do not eat or drink anything after midnight.
For a PM (afternoon) procedure time: You may continue to have clear liquids until 8am.