I think what you got (PEG) is the generic version of the dreaded GoLytely we use for prepping. *cue slasher music here* Ha ha, just kidding about the freak reaction. Since you got it in a powder form and not in the usual gallon sludge form we're used to, it probably isn't so bad. I wouldn't, however, drink too much of that stuff if you want to be out and about in Montreal. You're bound to be stuck on the toilet, as it is, in fact, a powerful laxative.
I'm no doc, nor should I be telling you what to take or not take... BUT, if at all possible, I would avoid the laxative until you've returned from your trip. Here is my reasoning - 1) you don't know how you'll react to it, 2) better to be at home when trying new meds, 3) as it is a laxative, you don't want to only get to know all of Montreal's toilets - you want to see the other goodness the city has to offer.
*PLEASE, consult your doc before you alter any of your medication.
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