be sure to finish the drink by about 5 PM. I followed the instructions, thinking it made a gallon. It made about a gallon and a quart, I finished about 6:30pm and was up intermittently all night. Not nice.
It said to start after lunch, next time I will skip lunch and start about 11AM. Don't worry about being hungry, doesn't happen.
As for the meds they give you during the procedure, I just would like to say -
"May I please have the rest in a doggy bag?!"