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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]
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]
Gabapentin, approved for treatment of seizures and postherpetic neuralgia in adults, is used off-label for a variety of conditions including bipolar disorder, essential tremor, hot flashes, migraine prophylaxis, neuropathic pain syndromes, phantom limb syndrome, and restless leg syndrome. [11]
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]
Physical examinations usually involve testing responses to stimuli such as touch, temperature, and vibration. Neuralgia can be further classified by the type of stimuli that elicits a response: mechanical, thermal, or chemical. Response to the course of treatment is the final tool used to determine the mechanism of the pain. [3]
Higher doses were associated with a greater response to treatment. [8] [10] [9] A Phase II trial meant to assess the safety and efficacy of retigabine for treating postherpetic neuralgia was completed in 2009, but failed to meet its primary endpoint. Preliminary results were reported by Valeant as "inconclusive". [19]
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 ]
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