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methadone vs. methamphetamine

[ meth-uh-dohn ]
noun
  1. a synthetic narcotic, C21H28ClNO, similar to morphine but effective orally, used in the relief of pain and as a heroin substitute in the treatment of heroin addiction.
[ meth-am-fet-uh-meen, -min ]
noun
  1. a central nervous system stimulant, C10H15N, used clinically in the treatment of narcolepsy, hyperkinesia, and for blood pressure maintenance in hypotensive states: also widely used as an illicit drug.

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