@1fancydancear Mucinex in the green box contains dextromethorphan, a cough suppressant as well as guaifenesin. It is definitely not intended for daily or long term use, but can be useful during flare-ups.
Mucinex in the blue box contains ONLY guaifenesin, which is safe for longer term use. (On the advice of my ENT and pulmonology docs, I have used it regularly for over 40 years, without adverse effects, to thin mucus and keep the fluid in my ears from getting thick and blocking my eustachian tubes.)