Magnesium sulfate / potassium sulfate / sodium sulfate
"I'm a 42/female and this was my first time using Suprep. I was nervous at first but I found it to be a lot easier than expected. I've always had a very sensitive stomach so I had a colonoscopy when I was  19 and then I had to use enemas which was HORRIBLE so I highly recommend this over the enema route. It wasn't too hard to get down. "salty cough med" is EXACTLY what it tastes like so thanks to the other reviewers for their input. herlped me know what to expect. I felt a touch of queasiness at first, then chills and  tummy rumbling At the 45 min mark I visited the bathroom to see if anything would happen. Sure enough very easily it started. No straining or discomfort, but you won't leave the bathroom for awhile. A.m. should be easy I hope"