Seems anti-malarials are effective against it, some at preventing get it (high it seems) and some are also a suitable treatment. Mefloquine and Chloroquine being the main two. My opinion is that if you can source an anti-malarial, then they've got a very high chance of not catching it in the first place, which is why I've no idea why they're not prescribing to the front line NHS staff as a product that's already gone through all its safety testing. I bet they're handing it out like sweets at the white house and for her royal lizard here.
Azithromycin would be used in combination if you've caught it, as its an antibiotic, so if you're in hospital and if it's a choice of death or taking a punt on an safety approved anti-malarial and an anti biotic....
https://www.clinicaltrialsarena.com/news/pfizer-data-azithromycin-covid-19-trial/