MUCINEX 12 HOUR: Extended-release bi-layer tablet provides fast-acting and long-lasting relief for your toughest chest congestionSYMPTOMS TREATED: Thins and loosens mucus to make your cough more productive and relieves chest congestion caused by excess mucusINGREDIENTS: Guaifenesin (600 mg) is an expectorant that helps reduce chest congestion caused by colds, infections or irritantsONE EASY PILL: A unique bi-layer tablet, one layer for immediate release, the other layer for extended release so the medicine starts to work right away and lasts for up to 12 hoursCONTINUOUS RELIEF: Mucinex SE medicine powers through chest congestion for up to 12 hours so you can say goodbye to retaking medicine every 4 hoursTRUST MUCINEX: Mucinex is the #1 doctor recommended OTC expectorant among Internists, General Practitioners & Family Practitioners and the #1 Cough Cold Brand Doctors Trust for Themselves & Their FamiliesBUY WITH CONFIDENCE: When you see 'Ships from and sold by Amazon.com', you can buy with confidence - Mucinex cannot guarantee the quality or authenticity of Mucinex products purchased from unauthorized sellers on AmazonSTOCK UP AND SAVE: Did you know, if you use Mucinex 12 Hour often you can find relief and save when you buy higher count packs