dex·tro·me·thor·phan .dek-strō-mi-'thȯr-.fan n a nonaddictive cough suppressant that is widely used esp. in the form of its hydrobromide C18H25NO·HBr in over-the-counter cough and cold preparations and is a codeine analog of levorphanol lacking the analgesic properties of codeine and producing little or no depression of the central nervous system
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n.
a drug used in lozenges, syrups, and linctuses to suppress coughs (see antitussive). It sometimes causes drowsiness, dizziness, and digestive upsets. See also triprolidine.
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dex·tro·meth·or·phan (dek″stro-məth-orґfan) [USP] a nonopioid, synthetic derivative of morphine that acts on the cough center to suppress the cough reflex, used as an antitussive; administered orally.Medical dictionary. 2011.