The best way to discover drugs for neuropathic pain, it seems, is by serendipity. No drugs are currently approved for neuropathic pain, a type of chronic pain that follows nerve-damaging diseases or injuries, nor does this type of pain respond well to conventional opioid pain relievers or NSAIDs. Studying the etiology of neuropathic pain, which can arise from diabetes, shingles, AIDS, or amputation, hasn't yielded any outstanding insights about treating it; nor has a target-based approach yet solved the problem, although Elan Corp. PLC is getting close with a neuronal calcium channel blocker known as ziconotide; for which it submitted an NDA in December 1999.
Several drugs approved for other indications, however, have serendipitously proven to be useful in the treatment of neuropathic pain, and...
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