You should tell your doctor about any allergies you might have to medications, and about any recent illnesses or other medical conditions, especially if you have had any irradiation treatment in the past for cancer of the prostate, uterus or rectum.
Women should always inform their doctor or x-ray technologist if there is any possibility that they are pregnant.
Your doctor will give you detailed instructions on how to prepare for your lower GI imaging. During the day before the procedure, you will likely be asked not to eat, and to drink only clear liquids like juice, tea, black coffee, cola, or broth, and avoid dairy products. After midnight, you should take nothing by mouth. You may also be instructed to take a laxative (in either pill or liquid form) and to use an over-the-counter enema preparation the evening, or even a few hours before the procedure. Just follow your doctor's instructions. It is permissible to take usual prescribed oral medication with limited amounts of water.
Once you arrive at the imaging center, you will be asked to change into a gown before your examination. You may also be asked to remove jewelry, eyeglasses, or any metal objects that could obscure the images.