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A colonoscopy is an exam used to detect changes or abnormalities in the large intestine, or colon, and rectum. It’s an important exam that’s performed to check for colon cancer. But some would agree that preparing for the colonoscopy is worse than the exam itself.

In this Mayo Clinic Minute, Dr. James East, a gastroenterologist at Mayo Clinic Healthcare in London, explains what patients will need to do to prepare for this exam and how to make it a little easier.

Before a colonoscopy, your health care provider may ask you to do certain things to empty your colon.

“Colonoscopy prep is a difficult thing, and it probably is the thing that patients like the least about having a colonoscopy,” says Dr. East.

Besides following a special, low-fiber diet in the days leading up to the exam, patients also will be asked to take a liquid laxative prior to their appointment.

“Many of the preps now come in quite a high volume. There may be 2 liters or sometimes even 4 liters to drink,” says Dr. East.


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A few tricks to help it go down a little easier are to premix it and let it get nice and cold in the fridge. Dr. East says putting some clear citrus flavoring in it helps make it a little more palatable.

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