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.
Antidiarrheal medicines include loperamide (1 brand name: Imodium) and bismuth subsalicylate (2 brand names: Kaopectate, Pepto-Bismol). Bismuth subsalicylate can also be used for upset stomach and as an antiemetic (a medicine that treats nausea and vomiting).