https://en.wikipedia.org/wiki/Favipiravir
unapproved in US, UK, approved in Japan.
I was given this in quarantine in January, I don't know if it helped as I was symptomless to begin with.
I was lucky this morning; my luggage appeared at the belt as I approached it. Immigration was busy (we were a full airbus a380) but well-directed, the queue took less than 30 minutes. One hour after landing I was in a cab.
Caught it on a Qatar flight that was very unruly (no masks, loutishness, drunks wandering around) without any intervention of the staff. This was in January.