What is the appropriate dosage for Mucinex DM?

The appropriate dosage for Mucinex DM is one or two tablets every 12 hours for adults and children who are 12 years and older. It should be taken with a full glass of water. The maximum dosage is four tablets in 24 hours, according to Drugs.com.

Mucinex DM is an over-the-counter medicine that helps loosen phlegm, reduces bronchial secretions and encourages productive coughing. It also temporarily relieves coughing caused by the common cold or irritants. Patients who suffer from a chronic or persistent cough should not take this medicine.

An overdose on Mucinex DM may cause serious side effects including brain damage, seizure and even death, as stated by WebMD.