The main point of preparation for colonoscopy for long-term constipation is to start a non-residue diet in the first two days, and the dosage of laxatives is different for each person, and should be used under the guidance of the doctor.
1. Constipated patients should start paying attention to their diet 2 to 3 days before the examination. The diet should be a non-residue diet, low-fat, avoiding seedy foods such as kiwi walnuts and watermelon, and also avoiding indigestible foods such as enoki mushrooms.
2. Medication is a small amount of lactulose or a small dose of magnesium sulfate solution can be started 3 days before the examination to promote bowel movement. Use polyethylene glycol to clean the intestines after dinner on the day before the colonoscopy to expel some of the accumulated stools, and take bowel cleansing solution early in the morning on the day of the examination to thoroughly clean the intestines.
The polyethylene glycol method is the more commonly used way of cleansing the bowel. Pour all of the Polyethylene Glycol Electrolyte Bulk into a larger container, add warm boiled water to the 2,000 to 3,000 mL mark to fully dissolve, and take 250 mL approximately every 10-15 min until watery, clear stools are expelled.
Follow your doctor’s instructions for specific preparation.