I just had a colonoscopy last week and would like to add to the discussion here. The prep I was assigned was the day before to start with 2 Dulcolax pills at 4pm. Then drink 10 oz of Mag Citrate at 5pm, then at 6pm starting 8 oz glasses of Miralax dissolved in Gatorade, for a total of 32 oz. I was able to go and was not too bad to drink. I used a straw to minimize the taste. I was able to purge out quite a bit, and started about 6:25pm.
The next morning I had to get up early, 6 hours before the procedure, and start drinking the remainder every 15 minutes until gone. The runs started within 10 minutes of drinking the first glass. The runs continued for about 1 1/2 hours and then stopped. My last output was not clear. I called the doctors office to talk to the advice nurse, per the instruction sheet I was given. I told her what was going on and said that we may need to reschedule the procedure! I said that I REALLY do not want to do that.
She asked if I had any Miralax or Mag Citrate in the house, and said no. And the instructions said no liquid for 4 hours prior to the exam, which is where we were on the clock. My wife who is ANTI-enema, wants nothing to do with them, suggested while I was on the phone with the nurse about taking an enema. I was floored! The nurse asked if I had a Fleet's enema at home and told her that I did not, but do have a kit for a tap water enema.
She called me back and after asking the doctor and he told me to do the tap water enema. My wife was excited for me! She knows how much I like enemas.
I am so glad I did, as I got out a nice plug of you know what, and was totally clear for my procedure.
The next time, I will be incorporating an enema into the prep. Hey, this was doctor approved.
This was my second colonoscopy and I struggled with the first prep 10 years ago. I need to go back in 5 years, and will be using an enema at the beginning of the prep and the last thing of the prep.
Hope this helps you.