I,m having a colonoscopy procedure done tomorrow morning , & i,m prescribed to take move prep , which is unbe?

arable to take. I chose to take the oral solution magnesium citrate two bottles instead of the moveprep. It wasn,t approved by the Dr. They say, it damages the liver or the kidney. Although, i have used it in the past colonoscopy procedure , which it was prescribed by the Dr. I ,m not sure if it was the fleet phosphate or the magnesium citrate. I don,t know , if there is any difference . I"m perfectley healthy & have no problems with my liver or kidney or anything. I,m wondering what will happen if i didn,t follow my Dr,S directions, or anything will happen to me.