Mucinex Side Effects Center

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). 

What Are Side Effects of Mucinex DM?

Mucinex may cause serious side effects including:

• hives, 
• difficulty breathing, 
• swelling of your face, lips, tongue, or throat, 
• severe dizziness, 
• rash, and
• itching

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

Side effects of Mucinex DM include:

• dizziness, 
• drowsiness, 
• nausea, and 
• vomiting.

Seek medical care or call 911 at once if you have the following serious side effects:

• Serious eye symptoms such as sudden vision loss, blurred vision, tunnel vision, eye pain or swelling, or seeing halos around lights;
• Serious heart symptoms such as fast, irregular, or pounding heartbeats; fluttering in your chest; shortness of breath; and sudden dizziness, lightheadedness, or passing out;
• Severe headache, confusion, slurred speech, arm or leg weakness, trouble walking, loss of coordination, feeling unsteady, very stiff muscles, high fever, profuse sweating, or tremors.

This document does not contain all possible side effects and others may occur. Check with your physician for additional information about side effects.

Dosage for Mucinex DM

The dose of Mucinex DM for adults and children 12 years and older is 1 or 2 tablets every 12 hours; not more than 4 tablets in 24 hours.

Mucinex DM In Children

Mucinex DM is not recommended for use in children under 12 years of age. 

What Drugs, Substances, or Supplements Interact with Mucinex DM?

Mucinex DM may interact with other medicines.

Tell your doctor all medications and supplements you use.

Mucinex DM During Pregnancy and Breastfeeding

  Tell your doctor if you are pregnant or plan to become pregnant before using Mucinex DM. Consult your doctor before breastfeeding. 
 

Additional Information

Our Mucinex DM (guaifenesin and dextromethorphan hydrobromide tablet, extended release) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.