I had a very bad reaction to the colonoscopy prep liquid. I am thinking it happened from ingesting so much salt at one time. As I drank the stuff, I noticed the tinnitus in both ears becoming worse and worse, then the hearing faded out until I could hear almost nothing. Both ears. Then I became dizzy. I was sick all night, finally had to take a valium. Needless to say, I wasn't able to go to the appointment. I went through all that horrible prep for nothing. I'm still feeling really bad. This is the last time I ever do this.