• The combination of lopinavir and ritonavir, HIV protease inhibitors, is one antiviral candidate for COVID-19. Lopinavir/ritonavir has exhibited some signs of effectiveness against severe acute respiratory syndrome (SARS). Lopinavir acts against the viral 3CL protease, and ritonavir increases drug bioavailability. Lopinavir/ritonavir is widely available and relatively easy to scale.

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