A method of treating or preventing peripheral neuropathies includes administering a therapeutically effective amount of a cyclic amine derivative represented by general formula (I) or a pharmacologically acceptable salt thereof to a patient who needs treatmentwherein, carbon marked with * is asymmetric carbon； and A represents a group represented by general formulae (IIa), (IIb) or (IIc):wherein R1 represents a methyl group or an ethyl group optionally substituted with a halogen atom, R2 represents a hydrogen atom or an alkylcarbonyl group having 2 to 5 carbon atoms, each R3 independently represents a methyl group or an ethyl group, and n represents 1 or 2.
