Mucinex DM

Mucinex DM treats chest congestion and cough. Take with a full glass of water.

Mucinex DM Overview


Mucinex DM is an over the counter medication used to control cough and loosen chest congestion in adults and children 12 years of age and older.

It is a single product containing 2 ingredients: Guaifenesin and Dextromethorphan.

Guaifenesin belongs to a group of drugs called expectorants. These work by thinning the mucus in the air passages to make it easier to cough up the mucus and clear the airways. 

Dextromethorphan belongs to a group of drugs called cough suppressants. These work by decreasing activity in the part of the brain that causes coughing.

This medication comes in tablet and is taken twice daily with plenty of water.

Common side effects of Mucinex DM include dizziness, lightheadedness, and nervousness.


How was your experience with Mucinex DM?

First, a little about yourself

Tell us about yourself in a few words?

What tips would you provide a friend before taking Mucinex DM?

What are you taking Mucinex DM for?

Choose one
  • Other
  • Bronchitis
  • Common Cold
  • Cough
  • Laryngitis
  • Pharyngitis
  • Rhinitis, Allergic, Perennial
  • Sinusitis
  • Whooping Cough

How long have you been taking it?

Choose one
  • Less than a week
  • A couple weeks
  • A month or so
  • A few months
  • A year or so
  • Two years or more

How well did Mucinex DM work for you?

Did you experience many side effects while taking this drug?

How likely would you be to recommend Mucinex DM to a friend?



Mucinex DM consists of multiple generic medications. The generic medications are listed below.


For more information on this medication choose from the list of selections below.


For more information on this medication choose from the list of selections below.

Mucinex DM Drug Class

Mucinex DM is part of the drug class:


All RxWiki content including health news, medication pages, and condition pages published prior to February 2023, was written and maintained by on-staff pharmacists. Please be advised that this content is no longer actively maintained and may now contain outdated information. If you have any questions regarding previously published content, please contact