Magnesium citrate in high enough doses will act as a laxative that is correct. At 200 mg it is unlikely to give that effect. You might get a little gassy and yes Wade PEG is the preferred choice of most endoscopists but there are other products out there. I can't remember the last time I gave someone mag citrate for a planned endoscopy. I do however prescribe it sometimes as a laxative.
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