Polyethylene glycol 3350 with electrolytes
"It DIDN'T WORK! I followed the instructions to the latter, but MoviPrep didn't do the job.  It didn't completely cleanse the colon, and now I have to go through the whole colonoscopy session again with another preparation product.

The taste wasn't too bad (used hard candy between doses), and it started to work quite quickly.  It seemed to work as I spent a lot of time in the bathroom.  However it didn't do a complete job.  "