Colonoscopy Preparation (Over-the-Counter) - One-Day - Endoscopy Center Instructions

Sep 27, 2026

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One-day over-the-counter colonoscopy preparation instructions for a sedated endoscopy. The guide outlines medication holds, including avoiding anti-inflammatories like ibuprofen and naproxen, withholding certain supplements, and specific timing rules for diabetes medicines and GLP-1 receptor agonists. It details an approved clear-liquid plan the day before, outlines the day-of restrictions and dosing schedule for Miralax, Dulcolax, magnesium citrate, and simethicone, and includes safety notes for heart or kidney failure, color/food exclusions, and the need for a driver after sedation.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages2

Reading Time5 min

AccessFree to download

Medications and Precautions

Endoscopy (Hospital) Check-in

Buy These Items at the Pharmacy

The Day Before Your Procedure

Approved clear liquids

Avoid

Step-by-step schedule

Day of Procedure

Final timing and nothing by mouth

ONE-DAY Colonoscopy Preparation (Over-the-Counter) ENDOSCOPY CENTER 17820 Talbot Rd S Renton, WA 98055 425.690.3636 Park in lot at the center. Medications and Precautions No anti-inflammatories one day before procedure such as Advil (ibuprofen) or Aleve (naproxen)— Tylenol (acetaminophen) is okay. Low fiber diet, no multi-vitamins, iron, calcium supplements, seeds, or nuts for 7 days before procedure. Continue heart and blood pressure medications and aspirin—unless your doctor tells you to stop. Diabetes medicine—take 1/2 dose of insulin/oral diabetes medicine the evening before procedure. Hold insulin and/or oral diabetes medications the day of the procedure. ENDOSCOPY (HOSPITAL) 400 South 43rd St Renton, WA 98055 Park in South Tower Garage (Parking G). On Level P-2, enter the Special Procedure Care Unit (SPCU) reception area and check in. Hold blood thinners such as for days before procedure. Hold GLP-1 receptor agonists used for diabetes or weight loss, such as semaglutide (Ozempic, Rybelsus, Wegovy), liraglutide (Victoza, Saxenda), dulaglutide (Trulicity), tirzepatide (Mounjaro), or as follows: - If you are on weekly dosing, your last dose must be a minimum of one week prior to procedure. - If you are on daily dosing, your last dose must be a minimum of 24 hours prior to procedure. APPOINTMENT DATE CHECK IN TIME ! IMPORTANT: BECAUSE THIS IS A SEDATED PROCEDURE, YOU MUST HAVE A DRIVER TAKE YOU HOME. Buy These Items at the Pharmacy 8.3 oz. bottle of Miralax powder Dulcolax (bisacodyl) stimulant laxative tablets, 5 mg, 4 tablets total (NOT stool softeners) 64 oz. of Gatorade (one 64 oz. bottle OR two 32 oz. bottles) NO RED 10 oz. bottle of Magnesium Citrate (Lemon-Lime); if you have congestive heart failure (CHF) or kidney/renal failure—do NOT buy Simethicone (Gas-X) tablets, 125mg, 4 tablets total THE DAY BEFORE YOUR PROCEDURE 1. DRINK ONLY CLEAR LIQUIDS THE ENTIRE DAY; NO SOLID FOODS; NO MILK PRODUCTS OR NON-DAIRY CREAMER; NO ALCOHOLIC BEVERAGES. APPROVED Beverages: tea, coffee, soda/carbonated beverages, fitness water, sports drinks Fruit juices: apple, cran-apple, white grape, lemonade (no pulp) Desserts: flavored Jell-O, popsicles without pulp Bouillon: clear, fat-free bouillon ONLY Misc: salt, sugar AVOID No RED or PURPLE colors No solid food No milk products or non-dairy creamer No alcoholic beverages No stock, broth, or soup (store bought or homemade) 2. As a comfort measure, apply Vaseline, A&D ointment or Desitin to the anal area before laxative use. It is normal to pass yellow/green liquid stool after the prep. 3. At 12 pm, drink one 10 oz. bottle of Magnesium Citrate (Lemon-Lime) . Do NOT drink if you have congestive heart failure or kidney/renal failure. You may mix it with Sprite, 7-up or ginger ale. 4. At 3 pm, take two 5 mg Dulcolax tablets with a glass of water. 5. At 5 pm, mix together the ENTIRE BOTTLE (8 .3 oz./ 238 g) of Miralax with 64 oz. of chilled Gatorade. 6. Drink [an 8 oz. glass](an 8 oz. glass) of the Miralax solution every 15 minutes until you have finished drinking HALF OF THE MIXTURE (32 oz.). 7. At 9 pm, take two 5 mg Dulcolax tablets with a glass of water. 8. Take 2 tablets (125mg each) of Simethicone (Gas-X) . DAY OF PROCEDURE 1. At (6 hours before your scheduled procedure), drink [an 8 oz. glass](an 8 oz. glass) of the Miralax solution every 15 minutes until you have finished drinking the LAST HALF OF THE MIXTURE (32 oz.). 2. Take another 2 tablets (125mg each) of Simethicone (Gas-X) . 3. CLEAR LIQUIDS ONLY UNTIL (UP TO 4 HOURS BEFORE YOUR SCHEDULED PROCEDURE), THEN NOTHING BY MOUTH. Use the Google Translate app for your language © 2026 VMC (Rev 5/26) VMC-ENDO-00002

FAQs

What pain or anti-inflammatory medicines should be avoided before the procedure?

Avoid anti-inflammatories one day before the procedure, such as Advil (ibuprofen) or Aleve (naproxen). Tylenol (acetaminophen) is okay.

How should diabetes medicine be adjusted on the day before and the day of the colonoscopy?

Take 1/2 dose of insulin or oral diabetes medicine the evening before. Hold insulin and/or oral diabetes medications the day of the procedure.

What should be eaten and drunk the entire day before the procedure?

Drink only clear liquids for the entire day with no solid foods. Avoid milk products or non-dairy creamer, alcohol, and any red or purple colored items; follow the listed approved clear liquids and desserts.

Sep 27, 2026

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