My dr uses the most "humane" prep ever. You can eat a small breakfast the day before, a plain turkey sandwich for lunch and then the rest of the day clear liquids. At 6pm drink a bottle of magnisium...
My 78-year-old mother told me she has had two colonoscopy's (recommended because she's a breast cancer patient.) The first one she had the drug Versed. She said it was terrible that she was nauseated...