A method treats or prevents neuropathic pain with a synergistically-enhanced analgesic effect at a dose at which a calcium channel α2δ ligand does not produce any side effects as well as which agent does not produce any new side effects on the central nervous system. The therapeutic agent or a prophylactic agent used in the method includes as effective ingredients a cyclohexane derivative or a pharmaceutically acceptable salt thereof or a prodrug thereof, and a calcium channel α2δ ligand.
