I have pulmonary fibrosis, and have difficulty breathing because I am constantly coughing, trying to clear the mucus from my lungs. I have a salbutamol inhaler, but the small amount of relief it gives doesn';t seem to last very long. I have Codeine Linctus from my doctor, which I can take up to six times a day, but it doesn't seem to do anything to relieve my cough. I get really, really breathless and cough for twenty minutes with very little result. Any advice would be appreciated.