Herpes zoster (HZ) is characterized by a painful dermatomal rash and significantly affects quality of life, with acute pain increasing the risk of postherpetic neuralgia. Although early antiviral therapy limits viral replication, its analgesic effect is insufficient, and many patients experience inadequate relief despite stepwise use of non-opioids and opioids. Recent attention has focused on the potential role of muscle relaxant, which can relieve skeletal muscle spasms and associated pain in acute musculoskeletal conditions. Therefore, investigators hypothesize that baclofen may effectively reduce the severity of HZ pain without significantly increasing adverse events.
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the average numeric rating scale score over the past 24 hours, rated each morning upon awakening and average over 7 days.
Timeframe: At week 4 after experimental drug medication