For a colonscopy, I finished half the drink and haven't gone to the bathroom. What should I do? Should I finish the drink?

You . You should finish the drink for the colon cleansing. Every person is different in their response to the "clean out" solutions, just like everyone has a slightly different bowel elimination pattern. If you are not cleaned out, the colonoscopy is not worth doing. Some people may even require 2 days of colon cleansing. Talk to your physician about your preparation!