I take 2 or 3 564 mgs per night Can this be harmful? My Dr. knows this. I've been having some of the symptoms of harmful effects. Diarrhea ... comes on suddenly and lasts for 2 or 3 weeks. At one point I lost 1/2 of my hemoglobin. needed 3 pts of blood. have had 2 or 3 colonoscopies plus dr. gave me a pill with a camera inside... he nothing showed up. No answers at all after that. ( I also never saw the pill come out ) I am now starting to go through his for 5th ? time. I hesitate to go to the dr. because I'm sure he will want me to go through the same thing (prep) with the same results. Any insight from anybody?