For the past three colonoscopies I have had, I used Pico Salax. It is over the counter in Canada and expensive ($40) but if the doctor writes a prescription for it you can get it for a lot less. I prefer this prep despite the cost because it consists of two small sachets.

During the prep day you can drink any amount of your choice of fluids as you want before that on that day - black tea, black coffee, clear broths, juices and jellos (both any colour except red, purple or blue). You take the first sachet, dissolved in 120ml. water, at 4:00 p.m. on your prep day. Then you take the second sachet at 10:00 p.m. on the prep day, continuing with intake of your choice of fluids. I think you are prescribed one or two Dulcolax with this prep too.

I was never able to finish GoLitely or Moviprep because it made me throw up after the first half of the prep! Hated it! Pico Salax is so easy to take! There is a generic brand of this - Purgo-something but I prefer the taste of the brand name Pico Salax. Both brands have the orange flavour, although the powder is white.