Citric acid / magnesium oxide / sodium picosulfate
"I used this for preparation of my 1st Colonscopy. The taste was pretty decent, citrus taste.  Took 1st dose at 4pm with 40 oz of clear fluids, within 3 hours I was going a lot for a good hour. 2nd dose 10pm with 30 oz of clear fluids, within 1 hour was going again. Procedure was at 7:30am, doctor was pleased with how well I was cleaned out. Procedure went well. Note, follow Drs. and medicines directions. Do not eat heavy a couple days before, Stay hydrated before and during. I have recommended this to others since my procedure in September."