| abstract |
The object of the present invention is to provide a sodium channel inhibitor having an analgesic effect on neuropathic pain, comprising a piperidine derivative and a pharmaceutically acceptable salt thereof as an active ingredient. Piperidine derivatives and pharmaceutically acceptable salts thereof, which are active ingredients of channel inhibitors, are characterized by having an amide, sulfonamide, urea or carbonyl structure in the substituent of the nitrogen atom of piperidine. |