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Background: Proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitors were approved in 2015 for use by adults with familial hypercholesterolemia (FH) or clinical atherosclerotic cardiovascular disease (ASCVD) requiring additional low-density lipoprotein cholesterol lowering beyond use of diet modification and maximally tolerated statin therapy. This study describes the patient, provider and payer related characteristics of prescriptions filled for this new class of injectable medication during 2016.Methods: 2016 quarterly state-level prescription data were obtained from Symphony Health Solution’s PHAST 2.0. PHAST 2.0 includes data on over 90% of prescriptions filled from US retail and mail order pharmacies and, along with market purchasing data, are used to calculate state and national estimates. PCSK9 inhibitor fills among adults aged ≥18 years were characterized by quarter, patient age, provider type, and payer type. Per-capita fill rates across US states and total and patient spending per 30-day supply were calculated.Results: In 2016, 216,082 PCSK9 inhibitor prescriptions were filled. The number of fills per quarter increased from 20,348, in Q1, to 83,812, in Q4, and fill totals were greatest among those aged 65-74 years (39.3% of fills) (Figure). Cardiologists prescribed the majority of fills (60.5%). Commercial payers (43.3%) and Medicare (43.1%) were the most frequent payers. State per-capita fill rates (per 100,000) ranged from 12.1, in WY, to 191.9, in LA (median: 69.1). Total spending per 30-day supply was $951; patient spending was $58 per 30-day supply.Conclusion: Quarterly fills for PCSK9 inhibitors quadrupled during 2016, with substantial variation in per-capita fill rates across states. Cardiologists prescribed the majority of fills, which aligns with their indicated use among adults with FH or ASCVD. Total spending per 30-day supply was considerable. Tracking of prescribing trends for these medications is warranted as additional information about their efficacy becomes available.