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Methadone is a racemate comprising equimolar amounts of dextromethadone and levomethadone. It is a opioid analgesic which is used as a painkiller and as a substitute for heroin in the treatment of heroin addiction. It has a role as an opioid analgesic, a xenobiotic, a serotonin uptake inhibitor, a mu-opioid receptor agonist, a NMDA receptor antagonist and an environmental contaminant. It contains a levomethadone and a dextromethadone.
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