Magnesium sulfate / potassium sulfate / sodium sulfate
"This is my first experience and I just pray I never have to do it again! Drinking this stuff was harrowing and I don't know how I'm going to get through the second dosage. After one sip I knew I was in trouble! I called my doctor's office and they said it would be ok to mix the 16 oz cup with ginger ale. So I took 4 oz of the mixture and mixed it into a tall glass of ginger ale. But then they called me back and said I shouldn't do that and that I shouldn't sip it, best to drink all at once. Nightmare! So I just took a deep breath and finished it. I was sure I would throw up, but luckily I didn't. I ran to the bathroom to rinse out my mouth with cold water. Then on the toilet for two hours. It works!"