Side Effects of Mucinex DM (guaifenesin and dextromethorphan hydrobromide)

Medically Reviewed on 11/12/2021

What is Mucinex DM?

Mucinex DM (guaifenesin and dextromethorphan hydrobromide tablet, extended release) is a combination of an expectorant and cough suppressant used to help loosen phlegm (mucus) and thin bronchial secretions to rid the bronchial passageways of bothersome mucus and make coughs more productive.

Mucinex DM temporarily relieves cough due to minor throat and bronchial irritation as may occur with the common cold or inhaled irritants, the intensity of coughing, and the impulse to cough to help you get to sleep. Mucinex DM is available over-the-counter (OTC).

Common side effects of Mucinex DM include dizziness, drowsiness, nausea, and vomiting.

Drug interactions of Mucinex DM include monoamine oxidase inhibitors (MAOIs).

If pregnant or breastfeeding, ask a health professional before use.

What are the side effects of Mucinex DM?

What are the serious side effects of Mucinex DM?

Mucinex DM may cause serious side effects including:

Get medical help right away, if you have any of the symptoms listed above.

What are the common side effects of Mucinex DM?

The most common side effects of Mucinex DM include:

Tell the doctor if you have any side effect that bothers you or that does not go away.

These are not all the possible side effects of Mucinex. For more information, ask your doctor or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Is Mucinex DM addictive?

No information provided

What drugs interact with Mucinex DM?

No information provided

Side effect list for healthcare professionals

No information provided

Treatment & Diagnosis

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Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Medically Reviewed on 11/12/2021
FDA Prescribing Information

Professional side effects, drug interactions, and addiction sections courtesy of the U.S. Food and Drug Administration.