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Cystic fibrosis clinical characteristics associated with dornase alfa treatment regimen change

When the chronic respiratory therapy dornase alfa was made commercially available for cystic fibrosis (CF) more than 20 years ago, two regimens were approved: 2.5 mg inhaled once daily (QD) or twice daily (BID). In the intervening years, there has been little guidance as to when to use each regimen. We have studied clinical practice patterns captured in the Epidemiologic Study of CF (ESCF) during the decade following dornase alfa approval (1994‐2005) to better understand clinical characteristics associated with QD versus BID dornase alfa use.