If you’re looking for the toughest chest congestion medicine to break up the mucus that’s bothering you, call in Maximum Strength Mucinex. One dose of Maximum Strength Mucinex starts to work fast and lasts for 12 hours.* Brand: Mucinex Dimensions: height: 400 weight: 0.15 length: 600 width: 500 Features: Relieves chest congestion caused by excess Mucus Thins & loosens mucus Starts to work right away & lasts for 12 hours Maximum Strength, Extended-release bi-layer tablet Mucinex is the #1 doctor recommended OTC expectorant among Internists, General Practitioners & Family Practitioners null null null null null null