We appreciate Dr. Kapoor’s interest in our article on the treatment of postherpetic neuralgia with the capsaicin 8 % patch [1]. Postherpetic neuralgia can be very difficult to treat and the development of new therapies is needed, particularly given the potential for side effects from current systemic therapies [2]. Vitamin C has low side effect liability and has been found to favorably affect one type of neuropathic pain, reducing the risk of complex regional pain syndrome following the wrist fracture [3]. We agree that further investigation of this agent in other types of neuropathic pain, such as postherpetic neuralgia, is warranted.
Conflict of interest
Nulifer Guleyupoglu has served as a consultant for NeurogesX and Eli Lilly and Co. Russell K. Portenoy served as consultant for Arsenal Medical Inc., Pfizer, Grupo Ferrer, Transcept Pharma and Xenon. Russell K. Portenoy also received departmental educational/research grants from Allergan, Ameritox, Boston Scientific, Covidien Mallinckrodt Inc., Endo Pharmaceuticals, Forest Labs, K-Pax Pharmaceuticals, Medtronic, Otsuka Pharma, ProStrakan, Purdue Pharma, Salix and St. Jude Medical. Sait Ashina, MD, has served as a consultant for NeurogesX and Depomed.
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Open AccessThis article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.