Use of a compound of formula (I), wherein X is CH or N, and when X is CH, R is H, OH, a linear or branched alkyl chain having from 1 to 3 carbon atoms, a linear or branched alkoxy chain having from 1 to 3 carbon atoms, or a halogen atom, and when X is N, R is H, or an acid addition salt thereof with a pharmaceutically acceptable organic or inorganic acid, to prepare a pharmaceutical composition active in the treatment of neuropathic pain. ##STR00001##