Magnesium sulfate / potassium sulfate / sodium sulfate
"I have had numerous scopes done since 2006, this by far has been the most palatable. Still gross, but much better than all the other ones prior. I read the reviews hoping to not sway my decision in the negative since this was a new prep for me.  The tips that do help are making sure the drink is cold, using a straw, mixing it with Sprite/water also and having a slice of lemon to suck on between drinks as needed. After the first hour, plan on parking on a toilet! You will feel bloated, burps, slight headache and keep a supply of latex gloves and Vaseline nearby with non-scented wipes. And a good supply of TP! Good luck"