The colonoscopy prep is always a source of frustration and much second-guessing.
First, we all can understand the importance of being totally cleaned out – (it's for our own benefit) - in order to facilitate obtaining meaningful results from the exam.
GI Docs all seem to have developed their very own recipe for accomplishing this task. But all include large amounts of liquid. (That IS important)
Here is what they NEVER seem to tell you up front (in my experience anyway).
The prep needs to be pursued until everything emerging from the far end is running clear, meaning no more chunks or pieces of solid materials. (IOW totally liquid)
The reason for advocating for a large amount of fluids accompanying the stimulant is for purposes of protecting the kidneys. One very good prep product was discontinued from use for colonoscopy preps a few years ago due to its negative affect on the kidneys of a few patients.
It has never ceased to amaze me that when they are doing an exam on a patient with chronic IBS-D, they seemingly mindlessly prescribe the exact same prep as they do for folks with IBSC. Go figure. (I always suspect a bit of sadism in this).
I recommend, that if one is using something like golytly, that the first glass be chilled. Then leave the rest out to warm to room temp. When one ingests such large amounts of cold fluid as fast as recommended for the colonoscopy prep, it lowers our core body temperature to a point of being really chilled. Then having to spend hours in bed with a heating pad trying to re-warm.
In my personal experience, I have nevr had to go much past about 1/2 the gallon of prep for good emptying results.
AND --- IMHO --- Not necessary to add this extreme chilled discomfort to the rest of the prep rigmarole.
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Re: Info about colonscopy
prescribe the exact same prep as they do for folks with IBSC. Go figure. (I always suspect a bit of sadism in this). 
