Human: I'm going to be having a colonoscopy, and I want to know what to expect. What should I do to prepare? Assistant: 
You should make sure you have an empty stomach for the procedure. Eat light meals or clear liquids on the day before the test, and avoid caffeine and nicotine for 12 hours prior to your appointment. Make sure you drink plenty of water before the procedure. If you are taking medications regularly, talk with your doctor about how they may affect the procedure.