The Analgesic Effect of Electroacupuncture on Postherpetic Neuralgia

Inclusion Criteria: * Patients who meet the diagnostic criteria for postherpetic neuralgia (with a clear history of acute herpes zoster, and the duration of postherpetic pain exceeds 90 days) * Aged 45 to 75 years old * Patients who were diagnosed with moderate or above pain during the observation period (the daily pain score was continuously collected within 7 days during the observation period, and the average NRS-11 pain score was \>=4) * Subjects who did not participate in other ongoing clinical studies * Sign informed consent and volunteer to participate in the study Exclusion Criteria: * Patients who are currently receiving or receiving more than one of the "permitted combinations" or any "prohibited combination and treatment" for PHN listed in the following part at least 14 days before screening, and are unwilling to undergo washout period, or patients with serious safety problems during washout period or observation period * Patients who are expected to receive any new prescription drug or other treatment for PHN after the start of the trial * Patients with serious uncontrolled medical conditions, such as cardiovascular, lung, liver, kidney, gastrointestinal tract, metabolism, endocrine, nervous system, respiratory system, urogenital system and other serious diseases, or systemic organ dysfunction, malignant tumor, hematologic disease such as bleeding tendency or coagulation dysfunction, serious mental illness such as depression or schizophrenia Symptoms, hepatitis…