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meth·a·done 'meth-ə-.dōn also meth·a·don -.dän n a synthetic addictive narcotic drug used esp. in the form of its hydrochloride C21H27NO·HCl for the relief of pain and as a substitute narcotic in the treatment of heroin addiction called also amidone
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n.
a potent narcotic analgesic drug administered by mouth or injection to relieve severe pain and as a linctus to suppress coughs. It is also used to treat heroin addiction. Digestive upsets, drowsiness, and dizziness may occur, and prolonged use may lead to dependence. Trade name: Physeptone.
Medical dictionary. 2011.