Feature Curbside ConsultAngiotensin-Converting Enzyme Inhibitors and Angiotensin Receptor Blockers in Patients With Coronavirus Disease 2019 Friend or Foe?Shyh, Grace I. PharmD*; Nawarskas, James J. PharmD†; Cheng-Lai, Angela PharmD‡Author Information From the *Department of Pharmacy, NewYork-Presbyterian Hospital, New York, NY †Department of Pharmacy Practice and Administrative Sciences, University of New Mexico College of Pharmacy, Albuquerque, NM ‡Department of Pharmacy, Montefiore Medical Center, Bronx, NY. Disclosure: The authors declare no conflict of interest. Correspondence: Grace I. Shyh, PharmD, Department of Pharmacy, NewYork-Presbyterian Hospital, 170 William Street, New York, NY. E-mail: email@example.com. Cardiology in Review: July/August 2020 - Volume 28 - Issue 4 - p 213-216 doi: 10.1097/CRD.0000000000000319 Buy Metrics Abstract When the coronavirus disease 2019 (COVID-19) wreaked an unprecedented havoc of an escalating number of deaths and hospitalization in the United States, clinicians were faced with a myriad of unanswered questions, one of the them being the implication of the renin–angiotensin–aldosterone system in patients with COVID-19. Animal data and human studies have shown that angiotensin-converting enzyme (ACE) inhibitors and angiotensin receptor blockers (ARBs) increase the expression of ACE2. ACE2 is an enzyme found in the heart, kidney, gastrointestinal tract, and lung and is a coreceptor for severe acute respiratory syndrome-related coronavirus-2 (SARS-CoV2), the virus responsible for COVID-19. Therefore, one can speculate that discontinuing ACE inhibitor or ARB therapy may lead to decreased ACE2 expression, thereby attenuating the infectivity of SARS-CoV-2, and mitigating the disease progression of COVID-19. However, several studies have also shown that ACE2 exhibits reno- and cardioprotection and preserves lung function in acute respiratory distress syndrome, which would favor ACE inhibitor or ARB therapy. This article is to examine and summarize the 2 opposing viewpoints and provide guideline recommendations to support the use or discontinuation of ACE inhibitors and ARBs in patients with COVID-19. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.