I am 56 yr. old female with COPD . I have run out of my year supply of Mucinex, and can not afford anymore. I am on limited income from a divorce still in process. I went to store today and got Mucus Relief from Walgreens ( Guaifenesin 400 mg / expectorant), and pharmacy tech said I should take them every 4 hrs. I am also taking natural foods , like blueberries, pineapple, strawberries, to help with anti-oxidants and inflamation of lungs. If I can change enough to stay healthy foods and get more active, do you think this will work for awhile? Thank you, Angela C. / Ft. Wayne