Mucinex DM

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Mucinex Dm
(Dextromethorphan / Guaifenesin)

Breaks up mucus and relieves cough. Mucinex Dm (Dextromethorphan / Guaifenesin) is okay for loosening congestion in your chest and throat, but it could prevent you from coughing the mucus up. It comes as an extended-release tablet and a short-acting liquid.
How it works
Mucinex Dm (Dextromethorphan / Guaifenesin) is a combination medicine. Guaifenesin is an expectorant that breaks up and thins out mucus. Dextromethorphan is a cough suppressant.
Type of medication
Cough suppressantExpectorantOver-the-counter
Available as
  • Pill
  • Extended release
  • Liquid
Used for (click to learn more)
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Reviews & ratings
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Side effects

We haven’t found good data for Mucinex DM side effects.

FDA side effect reports for Mucinex DM »
Risk factors for serious side effects
    • Using other medications that affect serotonin
      Detailed Mucinex Dm (Dextromethorphan / Guaifenesin) risks & warnings »
      Pregnancy category
      No specific alcohol-related info.
      No specific food-related info.
      Kidneys and liver
      No specific kidneys and liver-related info.
      No specific sex-related info.
      No specific sleep-related info.
      No specific weight-related info.
      Upsides and benefits
      • Mucinex Dm (Dextromethorphan / Guaifenesin) is a combination medicine that relieves multiple cold symptoms. It's good to use if you have chest congestion and a cough.
      • Helps loosen the mucus and phlegm that builds up in productive and wet coughs.
      • The extended release version of Mucinex DM lasts up to 12 hours.
      Downsides and risks
      • Mucinex Dm (Dextromethorphan / Guaifenesin) isn’t useful if you have a dry cough without mucus or phlegm.
      • The two medications in this product could potentially work against each other. Guaifenesin makes mucus easier to cough up, while dextromethorphan (the "DM" in Mucinex Dm (Dextromethorphan / Guaifenesin)) stops you from coughing.
      • Can cause sleepiness, dizziness, and an upset stomach.
      Tips from our pharmacists for people taking the medication
      • Cough suppressant starts working in 15 to 30 minutes.
      • Follow age-specific dosing instructions on how much to take. Don't take more than the recommended dose.
      • Drink plenty of fluids while taking Mucinex Dm (Dextromethorphan / Guaifenesin) because liquid helps break down mucus.
      • If your cough lasts more than 7 days, call your doctor.
      Learn more
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