The present invention discloses compounds of formula: where Ar.sub.1,
Ar.sub.2, X, R.sub.1, R.sub.2, R.sub.3, m, and n are as disclosed herein
or a pharmaceutically acceptable salt thereof (a "Phenylene Compound");
compositions comprising an effective amount of a Phenylene Compound; and
methods for treating or preventing pain and other conditions in an animal
comprising administering to an animal in need thereof an effective amount
of a Phenylene Compound.