A crystalline salt of 3-[2-(dimethylamino)methyl(cyclohex-1-yl)]phenol and hydrogen chloride, preferably in a 1:1 composition, including various crystalline forms of this salt, processes for preparing the various crystalline forms of this salt, pharmaceutical compositions containing the various crystalline forms of this salt, and the use of this salt as a pharmacologically active agent in a pharmaceutical composition to treat or inhibit pain or other disorders or disease states.