No one likes to be sick, but Mucinex 12-Hour Chest Congestion Expectorant Tablets makes every sick day a little easier. Mucus is a master of mayhem. It crowds your nose, throat and makes you miserable. Does Mucinex Start Working Quickly? The best chest congestion medicine provides quick, long-lasting relief. When it comes to chest congestion medicine, Mucinex provides great relief. And that relief is just one dose away. Mucinex expectorant tablets get to work fast and last for 12 hours. Mucinex 12-Hour Chest Congestion Expectorant Tablets give you the relief you need whenever the untimely cold comes your way. What Does Mucinex Relieve?...