I delayed my procedure because the prep requires no food, only clear liquids. I HAVE to eat a meal with my pain meds or I get an ulcer. My doctor approved for me to eat creamed vegetable soup (no milk) for 2 meals so I could still take pain meds. I got through the night prior with usual sleep, anxiety, and muscle relax meds. Then did fine with procedure. So if you have this situation, speak with your doctor about a creative solution.