The terms proximal (from Latin proximus, meaning 'nearest') and distal (from Latin distare, meaning 'to stand away from') are used to describe parts of a feature that are close to or distant from the main mass of the body, respectively.
But, with Citrucel and/or Metamucil you can start with one teaspoon mixed in water or juice. If you have diarrhea don't use the preparation with artificial sweeteners. Use the one with sugar. I think artificial sweeteners (some of them) might cause more diarrhea.
Although Metamucil is often marketed as a laxative it can actually be useful for both diarrhea and constipation sufferers. For diarrhea sufferers the extra fiber make the stool firmer and more solid. For constipation sufferers, the extra bulk can make waste food softer and easier to pass.