Guaifenesin / pseudoephedrine
"If I could rate this a "0", I would.  I took this Mucinex for the first time in the evening and woke up with what I believe to be "polyps" in my nose.  There are several hard bumps in my nose...the kind that if you pick at them, they will bleed.  I am appalled at the results and not sure where to turn next."