A colonoscopy is a test used to screen for colon cancer, which is a cancer of the large intestine. This diagnostic exam is performed by your doctor as an outpatient procedure. According to MayoClinic.com, it is the gold standard for colon cancer screening. During the test, a thin scope with a camera and light is inserted into your rectum, allowing your doctor to get a full view of your colon. However, for a clear view, your colon must be free of waste. Therefore, you will have to evacuate your colon before the exam.
Step 1
Take an osmotic laxative the night before your exam. Your doctor may prescribe one containing polyethylene glycol, such as Nulytely, Halflytely or Golytely. These bowel cleansers are available as powders that must be mixed with water before you take them. Add the water -- approximately 4 liters -- up to two days before the exam. However, if you mix it two days in advance, refrigerate it. The night before the colonoscopy, drink about 8 ounces every 10 minutes, until your stools are free of solid material. Magnesium citrate and sodium phosphate are possible alternatives to polyethylene glycol.
Step 2
Take a stimulant laxative such as bisacodyl in addition to the osmotic laxative. Bisacodyl works differently than polyethylene glycol. When taken together, they produce an additive effect. Usually, a doctor prescribes two 5-mg tablets of bisacodyl to be taken the day and night before the exam. An enema kit is another alternative that you may use to empty your colon.
Step 3
Don't eat any solid foods the day before the exam. Also, only drink clear liquids, such as water, carbonated drinks, tea and black coffee. Clear broths are also okay.
Things You'll Need
- Osmotic laxative
- Stimulant laxative
- Enema kit
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