Favipiravir, drugs, box, unregistered drug, hands in gloves.

Favipiravir, drugs, box, unregistered drug, hands in gloves.

Experimental Japanese antiviral drug for COVID-19 Favipiravir, in Prague, Czech Republic, April 5, 2021. (CTK Photo/Martin Macak Gregor)

Favipiravir, drugs, box, unregistered drug, hands in gloves.

Favipiravir, drugs, box, unregistered drug, hands in gloves.

Experimental Japanese antiviral drug for COVID-19 Favipiravir, in Prague, Czech Republic, April 5, 2021. (CTK Photo/Martin Macak Gregor)

Favipiravir, drugs, box, unregistered drug, hands in gloves.

Favipiravir, drugs, box, unregistered drug, hands in gloves.

Experimental Japanese antiviral drug for COVID-19 Favipiravir, in Prague, Czech Republic, April 5, 2021. (CTK Photo/Martin Macak Gregor)

Favipiravir, drugs, box, unregistered drug, hands in gloves.

Favipiravir, drugs, box, unregistered drug, hands in gloves.

Experimental Japanese antiviral drug for COVID-19 Favipiravir, in Prague, Czech Republic, April 5, 2021. (CTK Photo/Martin Macak Gregor)

Japanese drug favipiravir

Japanese drug favipiravir

The Japanese drug favipiravir to be administered to COVID-19 patients arrived in Prague's General Teaching Hospital (VFN), Czech Republic, April 27, 2020 and the hospital will distribute it to other Czech healthcare facilities. (CTK Photo/Vit Simanek)

Japanese drug favipiravir

Japanese drug favipiravir

The Japanese drug favipiravir to be administered to COVID-19 patients arrived in Prague's General Teaching Hospital (VFN), Czech Republic, April 27, 2020 and the hospital will distribute it to other Czech healthcare facilities. (CTK Photo/Vit Simanek)

Japanese drug favipiravir

Japanese drug favipiravir

The Japanese drug favipiravir to be administered to COVID-19 patients arrived in Prague's General Teaching Hospital (VFN), Czech Republic, April 27, 2020 and the hospital will distribute it to other Czech healthcare facilities. (CTK Photo/Vit Simanek)

Japanese drug favipiravir

Japanese drug favipiravir

The Japanese drug favipiravir to be administered to COVID-19 patients arrived in Prague's General Teaching Hospital (VFN), Czech Republic, April 27, 2020 and the hospital will distribute it to other Czech healthcare facilities. (CTK Photo/Vit Simanek)

Japanese drug favipiravir

Japanese drug favipiravir

The Japanese drug favipiravir to be administered to COVID-19 patients arrived in Prague's General Teaching Hospital (VFN), Czech Republic, April 27, 2020 and the hospital will distribute it to other Czech healthcare facilities. (CTK Photo/Vit Simanek)