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.
As with most options for fiber supplementation, there are some side effects that can occur as a result of a rapid introduction of fiber to the system. Typically, Metamucil side effects can occur include gassiness, bloating, feelings of fullness and pressure, stomach cramping or other mild gastrointestinal discomfort.