Hello,
Mucomyst is not a sulfa drug, so you can rest your mind about that part of your question. Pulmonary fibrosis involves scarring of the lungs in which scar (fibrotic) tissue takes over the normal lung tissue, which decreases the ability to exchange oxygen. This results in more difficulty breathing. It is usually permanent. Diagnosis of pulmonary fibrosis can be by x-ray, CT scan, bronchoscopy, broncial lavage or lung biopsy. Here is some more information.
http://www.pulmonaryfibrosis.org/ipf.htm
http://www.lungusa.org/site/pp.asp?c=dvLUK9O0E&b=35436#how
If you need further clarification, please ask.
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