I just had my 3 year follow-up colonoscopy with a clean bill of health. However, the 36 hour plus prep time is a real problem for maintaining potassium levels. Without any significant food for 44 hours by the time I got out of there I found there was no way for me to have sufficient potassium. Clear liquids don't cut it and don't buffer the potassium enough to be able to take enough supplements and don't contain much potassium. I couldn't take most of my vitamins because I need food to tolerate them. I'm going to have to find a solution, maybe literally, next time so I don't get into real trouble. My blood pressure went up 50 points and the spasms and heart irregularities became nearly uncontrollable by the time I got out of there. I had to take metoclopramide (Reglan) to get my stomach and intestines during prep and after to keep things working. I have had to take 300mgs of potassium every couple of hours to get things back under control after getting home a bit after 2 pm. It took about 10 hours to get the potassium up to where it needs to be to be able to go to bed, and I am still having some tendency to spasm. Perhaps inducing folate deficiency the next time will reduce the potassium need.