Head-to-head comparisons of medication uses, side effects, warnings, and more.
Deconex DMX is a combination of three medications: dextromethorphan (a cough suppressant), guaifenesin (an expectorant), and phenylephrine (a decongestant). It's used for cough and congestion and available over-the-counter as tablets and a liquid.
Mucinex DM (guaifenesin / dextromethorphan) is an over-the-counter medication that's used to relieve cough and loosen mucus. It has two active ingredients: guaifenesin (an expectorant that clears chest congestion) and dextromethorphan (a cough suppressant that relieves cough). The medication is available as tablets, dissolvable granules, and liquid that are taken by mouth, each with different dosages, directions, and age limits. Extended-release tablets are taken every 12 hours, while the other forms are usually taken every 4 hours. Most people have few to no side effects when used as directed, but it can sometimes cause stomach upset, dizziness, and drowsiness.
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