How far apart can i take milk of magnesia and miralax before a bowel prep? mirolax slows/stops my bowels in past. milk of magnesia has a quick positive effect?

Is the bowel prep for a colonoscopy? Is the milk of magnesia and miralax being taken as part of the bowel prep or ahead of time? If ahead of time, how much ahead-days? I think the best way to have your question answered is to ask the GI doctor performing the procedure.That doctor knows all the details I am referring to and knows your bowel history. So, call your GI doctor to ask the timing of meds