I'm currently doing this...as I type. I just drank the first prep (suprep) and am now downing 32 ounces over an hour. Then , unfortunately, I scheduled mine for early morning, I'll be getting up at 1am to take anti-nausea pills then drinking that stuff again. Last time, five years ago, it was tough going and I vomited. I'm hoping the anti nausea really helps.