MoviPrep
"I have had to have several colonoscopies over the years and have always been given picolax.  I was slightly concerned with the Moviprep as there was a lot to drink.  However if you pace yourself over say an hour its fine make sure its cold and maybe suck a halls menthal sweet with it.  It works quickly and much less pain and discomfort than with the Picolax.  I had it at 5pm went to the toilet a lot up until about 10pm then actually had a night sleep.  Next morning the same amount again, toilet for about another 4 hours then off to the hospital.  I seemed to be able to keep more hydrated with this preparation than with the Picolax as I did not feel so rotten and sick.  Much more comfortable experience all round."