Patients with cystic fibrosis (CF), a common life-shortening inherited disorder, often don’t take all their medications. It has been proposed that better adherence could improve these patients’ health more than any specific medical treatment. Investigators at PHAR, LLC, in collaboration with Genentech, Inc. conducted a retrospective cohort analysis and confirmed that there was generally low adherence to dornase alfa, a key drug for CF. The study also found that better adherence was associated with shorter hospital stays. This publication can be viewed by visiting the Journal of Medical Economics website.