Effects of a Therapeutic Interchange Between Branded and Generic Inhaled Therapy on Chronic Obstructive Pulmonary Disease

Objective To evaluate the difference in the occurrence of chronic obstructive pulmonary disease (COPD) exacerbations six months preconversion compared with six months postconversion from the branded inhaled corticosteroid/long-acting beta 2-agonist inhalers to the generic fluticasone/salmeterol inhalers. Design Retrospective cohort study using a six-month pre-/post-test design Setting Three primary care offices within a Management Service Organization (MSO) in South Florida. Patients, Participants Patients were included in the study if they had a diagnosis of COPD (in electronic medical record [EMR]), were at least 18 years of age, were under the care of a provider at one of the three primary care clinics within an MSO, and were switched from a branded ICS/LABA inhaler to a generic ICS/LABA inhaler between May 2019 and February 2020. This study included a total of 22 patients. Interventions Not applicable; this was a retrospective chart review. Main Outcome Measure The prevalence of COPD exacerbations leading to hospitalizations, emergency room visits, urgent care visits, or clinic visits. Results In this study, 10 (45.5%) patients experienced at least one exacerbation while on generic inhaler therapy compared with four (18.2%) patients while on branded inhaler therapy ( P = 0.05). Those on a generic inhaler were 3.8 times more likely to have a COPD exacerbation. Conclusion While changing patients from branded to generic inhalers may be appealing because of the potential benefits in cost-reduction, the results of this study conclude that the inhaler switch may lead to increased exacerbations. Prescribers need to be aware of potential complications that may be related to a therapeutic interchange.