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Deconex DMX and Mucinex DM are both over-the-counter medications that are used to treat cough. They both contain guaifenesin and dextromethorphan, which are both medications that treat cough in different ways. Deconex DMX also contains a third medication called phenylephrine, which is a decongestant. The FDA, however, has deemed phenylephrine to be ineffective as a decongestant when taken orally.
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