I Am Doing A Bowel Prep To Take A Endoscopic

I am doing a bowel prep to take a endoscopic capsule tomorrow morning. On my second bottle of Magnesium Citrate, I became very nauseous and vomited the contents of my stomach. I still had food from my dinner the night before and have not yet had any of the expected diarrhea. I have been on a clear diet all day long. Should I attempt to take another bottle of Magnesium Citrate or would that be potentially harmful?