ibromyalgia
"I never thought that an expectorant used to treat coughs could be this effective for Fibromyalgia pain.  I am a pre-med student and when I heard about the possibility of Mucinex(Guaifenesin) being able to relieve pain caused by Fibromyalgia I decided to try it.  It has worked better than NSAID'S (Ibuprofen, Aleve, Celebrex) for me.  400mg works great (600mg if using the extended release tablets.)"