Pharmacologic Treatments for Coronavirus Disease 2019 (COVID-19): a Review
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Clinical Review & Education JAMA | Review Pharmacologic Treatments for Coronavirus Disease 2019 (COVID-19) A Review James M. Sanders, PhD, PharmD; Marguerite L. Monogue, PharmD; Tomasz Z. Jodlowski, PharmD; James B. Cutrell, MD Viewpoint pages 1769, and IMPORTANCE The pandemic of coronavirus disease 2019 (COVID-19) caused by the novel 1767 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) presents an unprecedented Related article page 1839 challenge to identify effective drugs for prevention and treatment. Given the rapid pace of CME Quiz at scientific discovery and clinical data generated by the large number of people rapidly infected jamacmelookup.com by SARS-CoV-2, clinicians need accurate evidence regarding effective medical treatments for this infection. OBSERVATIONS No proven effective therapies for this virus currently exist. The rapidly Author Affiliations: Department of expanding knowledge regarding SARS-CoV-2 virology provides a significant number of Pharmacy, University of Texas potential drug targets. The most promising therapy is remdesivir. Remdesivir has potent in Southwestern Medical Center, Dallas vitro activity against SARS-CoV-2, but it is not US Food and Drug Administration approved (Sanders, Monogue); Division of Infectious Diseases and Geographic and currently is being tested in ongoing randomized trials. Oseltamivir has not been shown to Medicine, Department of Medicine, have efficacy, and corticosteroids are currently not recommended. Current clinical evidence University of Texas Southwestern does not support stopping angiotensin-converting enzyme inhibitors or angiotensin receptor Medical Center, Dallas (Sanders, Monogue, Cutrell); Pharmacy Service, blockers in patients with COVID-19. VA North Texas Health Care System, Dallas (Jodlowski). CONCLUSIONS AND RELEVANCE The COVID-19 pandemic represents the greatest global public health crisis of this generation and, potentially, since the pandemic Corresponding Author: James B. Cutrell, MD, Division of Infectious influenza outbreak of 1918. The speed and volume of clinical trials launched to investigate Diseases and Geographic Medicine, potential therapies for COVID-19 highlight both the need and capability to produce Department of Medicine, University high-quality evidence even in the middle of a pandemic. No therapies have been shown of Texas Southwestern Medical effective to date. Center, 5323 Harry Hines Blvd, Dallas, TX 75390-9113 (james.cutrell@ utsouthwestern.edu). JAMA. 2020;323(18):1824-1836. doi:10.1001/jama.2020.6019 Section Editors: Edward Livingston, Published online April 13, 2020. MD, Deputy Editor, and Mary McGrae McDermott, MD, Deputy Editor. he global pandemic of novel coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syn- Methods drome coronavirus 2 (SARS-CoV-2) began in Wuhan, T 1 China, in December 2019, and has since spread worldwide. As of A literature review was performed using PubMed to identify rel- April 5, 2020, there have been more than 1.2 million reported evant English-language articles published through March 25, 2020. cases and 69 000 deaths in more than 200 countries. This novel Search terms included coronavirus, severe acute respiratory syn- Betacoronavirus is similar to severe acute respiratory syndrome drome coronavirus 2, 2019-nCoV, SARS-CoV-2, SARS-CoV, MERS- coronavirus (SARS-CoV) and Middle East respiratory syndrome CoV, and COVID-19 in combination with treatment and pharmacol- coronavirus (MERS-CoV); based on its genetic proximity, it likely ogy. The search resulted in 1315 total articles. Due to the lack of originated from bat-derived coronaviruses with spread via an RCTs, the authors also included case reports, case series, and unknown intermediate mammal host to humans.1 The viral review articles. The authors independently reviewed the titles and genome of SARS-CoV-2 was rapidly sequenced to enable diagnos- abstracts for inclusion. Additional relevant articles were identified tic testing, epidemiologic tracking, and development of preventive from the review of citations referenced. Active clinical trials were and therapeutic strategies. identified using the disease search term coronavirus infection on Currently, there is no evidence from randomized clinical trials ClinicalTrials.gov and the index of studies of novel coronavirus (RCTs)thatanypotentialtherapyimprovesoutcomesinpatientswith pneumonia in the Chinese Clinical Trial Registry.2 either suspected or confirmed COVID-19. There are no clinical trial datasupportinganyprophylactictherapy.Morethan300activeclini- cal treatment trials are underway. This narrative review summa- SARS-CoV-2: Virology and Drug Targets rizes current evidence regarding major proposed treatments, re- purposed or experimental, for COVID-19 and provides a summary SARS-CoV-2, a single-stranded RNA-enveloped virus, targets cells of current clinical experience and treatment guidance for this novel through the viral structural spike (S) protein that binds to the epidemic coronavirus. angiotensin-converting enzyme 2 (ACE2) receptor. Following 1824 JAMA May 12, 2020 Volume 323, Number 18 (Reprinted) jama.com © 2020 American Medical Association. All rights reserved. Downloaded From: https://jamanetwork.com/ on 09/24/2021 Pharmacologic Treatments for Coronavirus Disease 2019 (COVID-19) Review Clinical Review & Education Figure. Simplified Representation of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Viral Lifecycle and Potential Drug Targets MACM ROPO P HAGH AGE Tocilizumab SARS-CoV-2 Sarilumab Binds IL-6 receptor Prevents IL-6 receptor activation S protein IL-6 Inhibits IL-6 signaling ACE2 receptor Exocytosis TMPRSS2 A LVEOLOLL UUSS Soluble IL-6 receptor Camostat mesylate HOSS T CELLEL Inhibits TMPRSS2 Arbidol Prevents viral cell entry Targets S protein/ACE2 Membrane fusion interaction Chloroquine and endocytosis Inhibits membrane fusion Hydroxychloroquine of the viral envelope Inhibits viral entry and endocytosis by multiple mechanisms as well as host immunomodulatory effects Assembly Structural proteins Lopinavir Uncoating Ribavirin Darunavir Translation Remdesivir RNA Inhibits 3– Favipiravir RNA chymotrypsin- like protease Inhibits viral RdRp Translation RNA synthesis Polypeptides Nonstructural RNA-dependent Proteolysis proteins RNA polymerase (RdRp) Schematic represents virus-induced host immune system response and viral processing within target cells. Proposed targets of select repurposed and investigational products are noted. ACE2, angiotensin-converting enzyme 2; S protein, spike protein; and TMPRSS2, type 2 transmembrane serine protease. receptor binding, the virus particle uses host cell receptors and trials (including those not yet recruiting, recruiting, active, or com- endosomes to enter cells. A host type 2 transmembrane serine pleted) included pharmacological therapy for the treatment of protease, TMPRSS2, facilitates cell entry via the S protein.3 Once COVID-19 in adult patients. Of these 109 trials, 82 are interven- inside the cell, viral polyproteins are synthesized that encode for tional studies, with 29 placebo-controlled trials. Per description of the replicase-transcriptase complex. The virus then synthesizes the studies, there are 11 phase 4, 36 phase 3, 36 phase 2, and 4 RNA via its RNA-dependent RNA polymerase. Structural proteins phase 1 trials. Twenty-two trials were not categorized by phase or are synthesized leading to completion of assembly and release of not applicable. viral particles.4-6 These viral lifecycle steps provide potential tar- gets for drug therapy (Figure). Promising drug targets include nonstructural proteins (eg, 3-chymotrypsin-like protease, papain- Review of Selected Repurposed Drugs like protease, RNA-dependent RNA polymerase), which share homology with other novel coronaviruses (nCoVs). Additional Agents previously used to treat SARS and MERS are potential can- drug targets include viral entry and immune regulation didates to treat COVID-19. Various agents with apparent in vitro ac- pathways.7,8 Table 1 summarizes the mechanism of action and tivity against SARS-CoV and MERS-CoV were used during the SARS major pharmacologic parameters of select proposed treatments and MERS outbreaks, with inconsistent efficacy. Meta-analyses of or adjunctive therapies for COVID-19. SARS and MERS treatment studies found no clear benefit of any spe- cific regimen.37,38 Below, the in vitro activity and published clinical experiences of some of the most promising repurposed drugs for Ongoing Clinical Trials COVID-19 are reviewed. The search terms COVID OR coronavirus OR SARS-COV-2 on Clinical- Chloroquine and Hydroxychloroquine Trials.gov resulted in 351 active trials, with 291 trials specific to Chloroquine and hydroxychloroquine have a long-standing history COVID-19 as of April 2, 2020. Of these 291 trials, approximately 109 in the prevention and treatment of malaria and the treatment of jama.com (Reprinted) JAMA May 12, 2020 Volume 323, Number 18 1825 © 2020 American Medical Association. All rights reserved. Downloaded From: https://jamanetwork.com/ on 09/24/2021 1826 JAMA Clinical Review & Education Table 1. Summary of Pharmacology for Select Proposed COVID-19 Treatments May 12, 2020 Volume 323, Number 18 Major drug-drug Agent Target Adult dose/administration Contraindications Toxicities interactions Special populations Repurposed agents Chloroquine phosphate Blockade of viral entry by 500 mg by mouth every 12-24 h × 5-10 d. Available as: Hypersensitivity to Common: Abdominal cramps, CYP2D6 and CYP3A4 May be