Drug development has focused on reformulating existing drugs and creating alternative methods of drug delivery to improve safety and efficacy. Currently, there are 75 agents in clinical development. Of the 26 agents indicated for neuropathic pain, six specifically target postherpetic neuralgia. Other indications include diabetic peripheral neuropathy, central neuropathic pain due to spinal cord injury or multiple sclerosis and lumbosacral radiculopathy. Nociceptive pain indications include osteoarthritis pain and chronic low back pain.
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