Magnesium sulfate / potassium sulfate / sodium sulfate
"Ask for a different medication. I used one bottle and mixed with water, then 32 oz of water. Threw up 3 times. I am dreading the fact that I still have another bottle I have to drink in the morning before my appointment. I have had two of these appointments previously and never got this sick on the prep! It is the most horrible disgusting thing I have ever drank in my entire life!"