READ Mucinex DM 12 Hour Cough Medicine - Tablets - 20 Ct Exp 09/2027 Box has staining Expiration Date of 09/2027 Are you searching for reliable cough and cold medicine for adults? Look no further than Mucinex DM 12hr - a powerful expectorant cough suppressant. Featuring a robust 600 mg of guaifenesin and 30 mg of dextromethorphan HBr, this top-notch chest congestion cough medicine is here to provide effective symptom relief from bothersome excess mucus and persistent cough. When the cold and flu season hits, trust Mucinex for cough and cold symptom relief for adults. Our original bi-layer tablet provides immediate and extended-release and lasts up to 12 hours. Use as directed, for Adults and Children 12 years of age and over. (description exceeds maximum possible length)