From all I have read, the response to medication varies a lot. It depends on the nature of the underlying cause (neuropathic pain is generally a symptom, not a cause) and at the moment there seem to be no medications which have been developed specifically to deal with this type of pain. Most treatments were developed for other conditions for instance epilepsy and have shown, almost as a side effect, benefits for some of those affected by NP (not me unfortunately). Though if the underlying condition can be treated, or in the natural course of events disappears, the pain is not necessarily long term. Some nerves can regenerate. I'm a layman, so this is of course only an opinion informed by reading and sifting through a lot of stuff found elsewhere on the web.