Dextromethorphan is an antitussive.  It is used to relieve a nonproductive cough caused by a cold, the flue, or other conditions.  Dextromethorphan comes as a liquid or as a lozenge that is taken by mouth.Dextromethorphan is in products such as Robitussin, Sucrets Cough Control, HOld DM, St. Joseph Cough Suppressants, and Trocal.

References:
http://www.lycaeum.org/drugs.old/synthetics/dxm/faq/contents.html
http://www.insightpharma.com/sucrets.aspx
http://www.drugstore.com/templates/brand/default.asp?brand=7263&aid=333321&aparam=robitussin
http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a682492.html
http://www.erowid.org/chemicals/dxm/dxm_chemisty.shtml

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