A method for treating neuropathic pain by administering a pharmaceutical preparation containing N-acetylneuraminic acid or a pharmaceutically acceptable salt thereof to a person in need of treatment of neuropathic pain. Examples of neuropathic pain include trigeminal neuralgia, postherpetic neuralgia, strangulated neuropathy, complex regional pain syndrome (CRPS), diabetic neuropathy, neuropathy caused by trauma, phantom limb pain, central pain, and neuropathic pain caused by drug therapy or radiation therapy.
