{"id":"qutenza-patch","safety":{"commonSideEffects":[{"rate":"50-60","effect":"Application site erythema (redness)"},{"rate":"40-50","effect":"Application site pain or burning"},{"rate":"20-30","effect":"Application site edema (swelling)"},{"rate":"30-40","effect":"Transient increase in pain at application site"}]},"_chembl":{"chemblId":"CHEMBL1201180","moleculeType":"Small molecule","molecularWeight":"411.33"},"_dailymed":null,"mechanism":{"_ai_source":"claude-haiku-4.5","explanation":"Capsaicin, the active ingredient, binds to TRPV1 (transient receptor potential vanilloid 1) channels on C-fiber nociceptors, causing initial activation followed by prolonged desensitization. This leads to depletion of substance P, a key neurotransmitter in pain signaling, resulting in sustained analgesia in the treated area. 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