bye, bye cough. later chest congestion. hello 12 hours of relief. 12 hours!! hmmm, ok. not coughing at yoga? antiquing not coughing? not coughing at the movies?! hashtag still not coughing?! aaah. oww! mucinex dm gives you 12 hours of relief from chest congestion and any type of cough, day or night. it's not cough season. it's always comeback season.