A Retrospective Cohort Study of the 2018 Angiotensin Receptor Blocker (ARB) Recalls and Subsequent Drug Shortages on Patients with Hypertension

Abstract

ABSTRACTPurposeIn July 2018, the Food and Drug Administration recalled valsartan due to carcinogenic impurities, leading to an unprecedented drug shortage leading to management challenges impacting a large population of valsartan users. However, the extent to which the valsartan recall impacted clinical outcomes is unknown. Our objective was to compare the risk of adverse events between patients with hypertension using valsartan and a propensity-score-matched group of patients using non-recalled angiotensin receptor blockers (ARBs) and angiotensin converting enzyme-inhibitors (ACE-Is).MethodsWe conducted a retrospective cohort analysis of Optum’s de-identified Clinformatics® Datamart (July 2017–January 2019). Adults with hypertension who received valsartan were compared to persons who received non-recalled ARBs and ACE-Is for 1 year prior to and on the recall date. The primary outcomes were measured in the 6 months following the recall date included: 1) a composite measure of all-cause hospitalization, all-cause emergency department (ED) and all-cause urgent care (UC) visit, 2) a composite cardiac event measure of hospitalizations for acute myocardial infarction and hospitalizations/ED/UC visits for stroke/transient ischemic attack, heart failure or hypertension. Cox proportional hazard models compared the risk of outcomes between propensity-score-matched treatment groups.ResultsOf adults with hypertension, 76,934 received valsartan at the time of the recall and 509,742 received a non-recalled ARB/ACE-I. Valsartan use at the time of the recall was associated with a combined increased risk of all-cause hospitalization, ED or UC use (HR 1.02; 95% CI: 1.00–1.04) and of the composite of cardiac events (HR 1.22; 95% CI: 1.15–1.29) within six-months after the recall.ConclusionsThe national valsartan recall and subsequent shortage had negative consequences for patients with hypertension. As the threat of shortages increases for drugs that treat common outpatient conditions, systems at the local- and national-levels need to be strengthened to protect patients from drug shortages by providing them with safe and reliable alternatives.