noun
a synthetic narcotic drug used especially in the form of its hydrochloride for the relief of pain and as a substitute narcotic in the treatment of heroin addiction
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Methadone is a synthetic opioid used for pain relief and as a substitute for heroin in addiction treatment programs.
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My doctor prescribed me methadone to help manage my chronic pain.
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I heard some people call methadone 'liquid handcuffs' because it can be difficult to come off of.
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Using methadone as a crutch for dealing with emotional pain is not a healthy long-term solution.