that's where you swallow a pill size camera to check your insides, hubby is getting it done early monday morning. while looking at the paper telling him what to do I saw where you take a half bottle of Miralax twice once the day before and once 3 hours before taking the test,but doesn't tell you what size bottle, I thought if someone has had it they could tell me, I can't call the Dr he isn't in I asked at the drug store they have no ideal.I hate to give him too much or not enough and have to go thru this again