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Postherpetic neuralgia (PHN) is neuropathic pain that occurs due to damage to a peripheral nerve caused by the reactivation of the varicella zoster virus (herpes zoster, also known as shingles). PHN is defined as pain in a dermatomal distribution that lasts for at least 90 days after an outbreak of herpes zoster. [ 1 ]
EMA401 is a drug under development for the treatment of peripheral neuropathic pain.Trials were discontinued in 2015, with new trials scheduled to begin March, 2018. [1] It was initially established as a potential drug option for patients suffering pain caused by postherpetic neuralgia. [2]
Lexicon (LXRX) initiates dosing in a mid-stage study on LX9211 for the treatment of post-herpetic neuralgia.
It is a commonly used medication for the treatment of neuropathic pain caused by diabetic neuropathy, postherpetic neuralgia, and central pain. [11] It is moderately effective: about 30–40% of those given gabapentin for diabetic neuropathy or postherpetic neuralgia have a meaningful benefit. [12]
Treatment options include medicines and surgery. Neuralgia is more difficult to treat than other types of pain because it does not respond well to normal pain medications. Special medications have become more specific to neuralgia and typically fall under the category of membrane stabilizing drugs or antidepressants such as duloxetine (Cymbalta).
Atypical trigeminal neuralgia (ATN), or type 2 trigeminal neuralgia, is a form of trigeminal neuralgia, a disorder of the fifth cranial nerve. This form of nerve pain is difficult to diagnose, as it is rare and the symptoms overlap with several other disorders. [ 1 ]
The European Federation of Neurological Societies recommends pregabalin as a first-line agent for the treatment of pain associated with diabetic neuropathy, post-herpetic neuralgia, and central neuropathic pain. [54] A minority obtain substantial benefit, and a larger number obtain moderate benefit. [55]
Neuropathic pain and post-herpetic neuralgia can commonly persist for more than 3 months and a year to 18 months is not uncommon. More than 50% of patients report experiencing post-herpetic neuralgia. [2] Post-herpetic fatigue is also a common long term side effect and may persist for several months to a year or more.