The Best Colonoscopy Prep Tips, According to Doctors
Guidelines recommend a colonoscopy at age 45—down from 50. Most say the prep drink is worse than the actual procedure. Here’s how to make drinking it more tolerable.
What is your bowel baseline?
Everyone will tolerate colonoscopy prep differently. It depends on how your bowels are functioning before the prep. “For instance, someone with severe irritable bowel syndrome may not tolerate a bowel prep very well,” says Jeffery Nelson, MD, the surgical director of The Center for Inflammatory Bowel and Colorectal Diseases at Mercy Medical Center, in Baltimore, MD. But sometimes, even people with no prior digestive problems can have issues like stomach pain or nausea. If you are constipated before prep begins, let your doctor know as he or she may suggest a laxative to help with overall prep. These are 11 things your bowel habits can reveal about your health.
Eat these foods before bowel prep
“It always helps to start prepping a few days prior, but it is not always feasible or desired,” says Rashmi Kumar, MD, a gastroenterologist with the Banner-University Medicine Digestive Institute in Phoenix, AZ. Focus on eating low-fiber foods two to three days before bowel prep. Eating foods that digest easily—white rice, plain crackers, white bread, canned fruit, veggies, chicken, fish, eggs, and yogurt—and leave your system quickly help with the bowel prep.
But stay away from these foods
A clear liquid diet is necessary the day before a colonoscopy and will be prescribed, but there are some other restrictions you should know about that begin three to seven days before. “I recommend a low-residue diet that avoids foods containing seeds, corn, nuts, and other indigestible substances,” says Dr. Kumar. Indigestible foods including anything with whole wheat in the ingredients, raw fruit or veggies with seeds or skin, legumes, beans, lentils, and popcorn. Basically, any high fiber foods should be avoided. It may seem counterintuitive, as including high-fiber foods in your diet is one of 12 everyday habits that can help reduce your risk of colon cancer, but avoiding anything that is slow to digest will ensure the colonoscope—a thin, tube-like instrument with a light and a lens for inspecting your colon—can get a clear view.
Mary Poppins approves this tip
The chalky taste and texture of laxative prep make the large volumes you need to drink even more difficult to swallow. But as Mary Poppins recommends, a spoonful of sugar can help the medicine go down. Dr. Kumar suggests ginger, lime, Crystal Light, or Kool-Aid powder—as long as it isn’t red or purple, which could be mistaken for blood in the colon. Gatorade and ginger ale are okay too, but if you are using a clear beverage, make sure it isn’t carbonated. Let it go flat and then mix it with the prep drink.
Get it down quick
Sweeteners alone may not be enough to get you through the nasty-tasting prep drink—many people say it’s the hardest part of a colonoscopy (even worse than the procedure itself!). Here are some more ways to make the laxative less horrible: Chill it and drink it through a straw—it’ll go down faster, and if you place the straw as far back on the tongue as possible, you won’t taste it as much. After you finish a dose, suck on a lemon wedge or any tart hard candy (again, no red or purple dyes) to mute the taste. Dr. Kumar suggests another familiar method: “Hold the nose and drink it as quickly as possible.”
Get past cramping and nausea
It’s not uncommon to experience bloating, abdominal cramping, or nausea while prepping. Dr. Kumar’s tip is to slow down the laxative if this happens. “The first thing to do is to take a break from drinking the bowel prep for about 30 minutes to an hour. Once the symptoms are abated or resolved, then start the bowel prep again but at a reduced rate,” advises Dr. Kumar. If nausea and vomiting persist, get in touch with your doctor. “An anti-nausea medication like Zofran can be prescribed.”
Pamper your derriere
Since you’re going to be spending a lot of time on the toilet, consider scheduling your colonoscopy for a Monday morning so you can prep on Sunday and only miss one day of work. And treat yourself to some extra soft toilet paper. If you’re feeling sensitive back there, try some adult wet wipes with aloe and vitamin E in lieu of toilet paper. (Just don’t buy the wipes with alcohol—it can cause burning and irritation.) Tucks medicated wipes are helpful too; soothing products like Vaseline or Destin may also reduce chafing, says Dr. Kumar. Just be careful not to flush the wipes. Don’t miss these 22 bathroom mistakes you didn’t know you were making.
Don’t cheat on this
This is arguably the best colonoscopy prep tip of all: Be sure to down all the laxative drink. The amount of prep drink prescribed by your doctor is to ensure a good visualization. “The point of the colonoscopy is to clearly see the lining of the colon to find polyps and other potentially serious problems, but the camera in the scope can’t see through solid stool, ” says Dr. Nelson. So, even if everything is coming out the other end clear before you’ve finished the laxative, continue drinking it until it’s all gone. If there’s poor visibility during the procedure, says Dr. Kumar, “you may need a repeat colonoscopy, which means a repeat clean-out process.” If you can’t tolerate drinking 2 quarts of prep liquid, ask your doctor about split-dosing. Prepopik requires you to drink just 10 ounces of prep liquid split into two doses that you drink at different intervals. After drinking the first 5 ounces, you need to drink five 8-ounce glasses of water throughout half the day; three 8-ounce glasses of water are required after the second dose.
Tell your doc if you’re taking these
If you’re taking prescription meds, NSAIDs (nonsteroidal anti-inflammatory drugs such as Motrin), or herbal supplements, give your doc the heads-up. You may have to stop or cut down prior to the procedure. “NSAIDs may increase the risk for bleeding, so it is usually advised to stop three to four days prior,” says Dr. Kumar. If you take oral meds or use insulin to manage diabetes, you’ll need to adjust the dosage prior to and on the day of the colonoscopy. Blood thinners can also pose a problem as they increase the risk of bleeding after biopsy or removal of polyps, so “hold off for a few days before,” says Dr. Kumar. “However, a patient should never hold off without discussing it with their doctor.”
Ask your doc about post bloat
After the procedure, some patients get painful bloating and gas. This is because doctors inflate your colon with a technique called insufflation in order to get a better view. Some doctors use air while others use carbon dioxide (CO2). “Several studies have shown significantly less pain and bloating with CO2 during the procedure at one hour, at six hours, and in some studies at 24 hours, compared with air insufflation,” says Dr. Kumar. Either way, you can expect to pass gas.
Do I really need a colonoscopy?
If you’re over the age of 45, then yes. If you’re younger, talk with your doctor about your family history to determine if you need a colonoscopy sooner. You may also be able to use the at-home stool test called FIT (fecal immunochemical test) to screen for colon cancer. A review of studies published in 2019 in the Annals of Internal Medicine shows the strongest evidence to date that people at average risk for colon cancer can opt for a yearly FIT test in lieu of a colonoscopy. But what does average risk mean? “People without a family history of colon cancer in close relatives such as parents, siblings, and children, or those with no personal history of colon cancer or pre-cancerous polyps,” says gastroenterologist Douglas Corley, MD, PhD, a research scientist whose focus is colorectal cancer at Kaiser Permanente Northern California Division of Research in Oakland, CA. A family history is just one of the 9 factors that may increase your risk of colon cancer.
- National Cancer Institute: “NCI Dictionary of Cancer Terms.”
- Jeffery Nelson, MD, surgical director of The Center for Inflammatory Bowel and Colorectal Diseases at Mercy Medical Center, Baltimore, MD.
- Rashmi Kumar, MD, gastroenterologist with the Banner-University Medicine Digestive Institute in Phoenix, AZ.
- Kaiser Permanente: “Low-Fiber Diet for Colonoscopy Preparation.”
- Gastroenterology: “Optimizing Adequacy of Bowel Cleansing for Colonoscopy: Recommendations From the US Multi-Society Task Force on Colorectal Cancer.”
- American Cancer Society: “American Cancer Society Guideline for Colorectal Cancer Screening.”
- Annals of Internal Medicine: “Performance Characteristics of Fecal Immunochemical Tests for Colorectal Cancer and Advanced Adenomatous Polyps: A Systematic Review and Meta-analysis.”
- Douglas Corley, MD, PhD, gastroenterologist and research scientist at Kaiser Permanente Northern California Division of Research, Oakland, CA.