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.
Metamucil can also be used if ok'ed by your vet at 1g per pound of weight once to twice a day as needed to maintain stool consistency. It does not work overly well when used for an already blocked up cat, but if the situation hasn't become immediate yet, you may be able to try this first.