Safety of High-Intensity Statins in the Veteran Population: Atorvastatin 40 to 80 mg Compared With Rosuvastatin 20 to 40 mg

Background: High-intensity statin therapy is recommended in patients with clinical atherosclerotic cardiovascular disease (ASCVD) or at high risk of ASCVD. Current evidence demonstrates efficacy of high-intensity statin therapy in reducing major adverse cardiovascular events; yet the comparative safety profile between high-intensity statin agents remains unknown. In 2011, when atorvastatin became generic, the Veteran’s Health Administration made the formulary switch from rosuvastatin to atorvastatin. Currently, rosuvastatin is generic; however, at the time of this study, it was still under patent. Objective: The primary objective was to determine if high-intensity atorvastatin compared with rosuvastatin is associated with an increased incidence of adverse drug reactions (ADRs) in the veteran population. Methods: A retrospective cohort study at James A. Haley Veterans’ Hospital compared patients receiving rosuvastatin 20 to 40mg from January 2009 to November 2011 (n = 4,165) and atorvastatin 40 to 80mg from May 2012 to June 2016 (n = 5,852). Patients were excluded if they were nonadherent to statin therapy or had a documented ADR to atorvastatin prior to formulary switch. Results: A difference in overall ADR rates was found between atorvastatin and rosuvastatin groups (4.59% vs 2.91%; odds ratio [OR], 1.61; 95% CI, 1.29 to 2.00; P < 0.05). Statistically significant differences in abnormal liver transaminases (3.99% vs 1.39%; OR, 2.95; 95% CI, 2.21 to 3.94; P < 0.05) and statin-associated muscle symptoms (1.14% vs 0.5%; OR, 2.29; 95% CI, 1.39 to 3.74; P < 0.05) were identified between groups. Patients receiving rosuvastatin were on therapy 2.5 times longer before developing an ADR. Conclusion and Relevance: High-intensity atorvastatin compared with rosuvastatin is associated with an increased incidence of ADRs.