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Lidocaine Patches

Lidocaine patches are used to relieve the pain of post-herpetic neuralgia (PHN; the burning, stabbing pains, or aches that may last for months or years after a shingles infection). Lidocaine is in a class of medications called local anesthetics. It works by stopping nerves from sending pain signals

https://medlineplus.gov/druginfo/meds/a603026.html