Heparin as a therapy for COVID-19: current evidence and future possibilities

Am J Physiol Lung Cell Mol Physiol. 2020 Aug 1;319(2):L211-L217. doi: 10.1152/ajplung.00199.2020. Epub 2020 Jun 10.


Coronavirus disease 2019 (COVID-19), the clinical syndrome associated with infection by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has impacted nearly every country in the world. Despite an unprecedented focus of scientific investigation, there is a paucity of evidence-based pharmacotherapies against this disease. Because of this lack of data-driven treatment strategies, broad variations in practice patterns have emerged. Observed hypercoagulability in patients with COVID-19 has created debate within the critical care community on the therapeutic utility of heparin. We seek to provide an overview of the data supporting the therapeutic use of heparin, both unfractionated and low molecular weight, as an anticoagulant for the treatment of SARS-CoV-2 infection. Additionally, we review preclinical evidence establishing biological plausibility for heparin and synthetic heparin-like drugs as therapies for COVID-19 through antiviral and anti-inflammatory effects. Finally, we discuss known adverse effects and theoretical off-target effects that may temper enthusiasm for the adoption of heparin as a therapy in COVID-19 without confirmatory prospective randomized controlled trials. Despite previous failures of anticoagulants in critical illness, plausibility of heparin for COVID-19 is sufficiently robust to justify urgent randomized controlled trials to determine the safety and effectiveness of this therapy.

Keywords: COVID-19; heparin; venous thromboembolism.

Publication types

  • Research Support, N.I.H., Extramural
  • Review

MeSH terms

  • Anticoagulants / therapeutic use*
  • Antiviral Agents / therapeutic use*
  • Betacoronavirus / drug effects*
  • Blood Coagulation Disorders / drug therapy*
  • Blood Coagulation Disorders / epidemiology
  • Blood Coagulation Disorders / virology
  • Coronavirus Infections / complications
  • Coronavirus Infections / drug therapy*
  • Coronavirus Infections / transmission
  • Coronavirus Infections / virology
  • Heparin / therapeutic use*
  • Humans
  • Pandemics
  • Pneumonia, Viral / complications
  • Pneumonia, Viral / drug therapy*
  • Pneumonia, Viral / transmission
  • Pneumonia, Viral / virology


  • Anticoagulants
  • Antiviral Agents
  • Heparin

Supplementary concepts

  • COVID-19
  • COVID-19 drug treatment
  • severe acute respiratory syndrome coronavirus 2