Relieves chest congestion</br>Thins and loosens mucus that causes chest congestion</br>Starts to work right away and lasts for 12 hours</br>Extended-release bi-layer tablet</br>#1 doctor recommended * *Mucinex is the #1 doctor recommended OTC expectorant among Internists?? General Practitioners and Family Practitioners. IMS Health?? NDTI (National Disease Therapeutic Index)?? MAT 52 Weeks Ending March 2011</br></br>Product Description</br></br>Mucinex breaks up the mucus that causes chest congestion while providing fast and long lasting relief. Mucinex is specially formulated in a bi-layer tablet. The immediate release layer goes to work fast while the extended release layer continues to work for 12 hours. And for your worst chest congestion symptoms?? try Maximum Strength Mucinex.</br><br/>http://www.amazon.com/gp/product/B005LEMQOS