Shouldn't: You are already taking a decongestant as the "d" of "dm" so more is just likely to cause side effects. Try vaporizer or other means of opening you up.
Answered 3/8/2013
5.3k views
Robitussin DM (guaifenesin and dextromethorphan): Contains a cough suppressant (dextromethorphan) and an expectorant (guaifenesin). Adding a low dose decongestant should not cause any interactions.
Answered 7/30/2018
5.3k views
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