{"id":"regional-block","safety":{"commonSideEffects":[{"rate":null,"effect":"Temporary numbness or weakness in the blocked region"},{"rate":null,"effect":"Bruising or hematoma at injection site"},{"rate":null,"effect":"Nerve injury (rare)"},{"rate":null,"effect":"Local anesthetic toxicity (rare)"}]},"_chembl":{"chemblId":"CHEMBL2075042","moleculeType":"Unknown"},"_dailymed":null,"mechanism":{"_ai_source":"claude-haiku-4.5","explanation":"Regional blocks work by delivering local anesthetic drugs (such as lidocaine or bupivacaine) to nerve bundles or plexuses, temporarily blocking nerve conduction and preventing pain sensation in the targeted anatomical region. 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