Robitussin is a brand name for a variety of cough syrups and cough gels, availiable in a wide varity of formulas.
Robitussin DM contains Guaifenesin (an expectorant), and DXM HBr (Dextromethorphan, a cough suppressant).
Robitussin A-C contains Guaifensesin and Codeine (also a cough suppressant), and is a schedule V controlled substance.
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