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.
According to the University of Maryland Medical Center, the psyllium in Metamucil absorbs liquid and creates bulk that moves waste through the digestive tract. This helps stool to solidify and pass more slowly. Metamucil also has been shown to be effective in treating constipation.