(Early days, but very promising.)
Novel antiviral strategy for treatment of COVID-19
The findings provide a new and readily available therapeutic option with high clinical potential for infection with SARS-CoV-2. This ground-breaking work has been published online in a top-class scientific journal Nature Microbiology. A related patent has been filed in the US.
https://phys.org/news/2020-10-antiviral-strategy-treatment-covid-.html
Paper:
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This is INDEED promising (though so far only in a rat?)
"[The drug] suppressed SARS-CoV-2 replication, leading to decreased viral loads in both upper and lower respiratory tracts"