17
Participants
Start Date
November 30, 2011
Primary Completion Date
October 31, 2014
Study Completion Date
October 31, 2014
N-acetyl-cysteine
900mg three times daily for 8 weeks
Placebo
Matching placebo three times daily for 8 weeks.
National Jewish Health, Denver
American Thoracic Society
OTHER
National Jewish Health
OTHER