cough
"I began with a sudden onset of mild, moving to severe lung congestion. I hacked and coughed so hard that I would gag. It wouldn't loosen or become what Dr. 's call productive no matter what OTC cough medicine I took. My Dr then put me on Guaifenesin and literally after the 1st dose, I could cough the gunk in my lungs up and out. I could actually lay flat again without chest pain and coughing fits. 
I noticed something else.... I have Fibromyalgia and was diagnosed in 1992. Idk if it was a coincidence or not, but my Fibro pain lessened!? I called my Rhuematologist and told him and he told me this was NOT a coincidence at all, and they used this medication as FM treatment years ago with success! I will forever take 600 mg!!"