"Make it make sense" To put it plainly, Mucinex, with its active ingredient guaifenesin, is designed to thin mucus — making it easier to cough up phlegm. And some people believe that its ...
Mucinex has many products that relieve tough cold & flu symptoms. Chest congestion is caused by excess mucus. Mucinex 12-Hour contains Guaifenesin that treats the cause of that congestion by ...