The Maximum Strength dosage of Mucinex DM includes higher levels of dextromethorphan and guaifenesin than most other Mucinex products, according to comparison charts on Mucinex.com. Dextromethorphan is a cough suppressant, and guaifenesin is an expectorant, and when these ingredients work together, they loosen phlegm build-up and decrease the amount of unproductive or painful coughing, explains Drugs.com. This drug can temporarily relieve coughing due to the common cold and can decrease coughing at night time, helping the user to sleep.
Mucinex claims that this bi-layer tablet works for up to 12 hours, constantly thinning mucus in the chest and throat. Because of the strength of the drug, children under the age of 12 should not take Mucinex DM Maximum Strength, and adults should take no more than two pills in a 24-hour period. If coughing is caused by smoking, asthma, chronic bronchitis or emphysema, Mucinex DM may not work as effectively as normal, according to Drugs.com. Users with any of these issues should contact a doctor before use. Due to the strength of this medication, users may experience side effects such as drowsiness, dizziness, or stomach aches.Learn more about Medications & Vitamins