This is a good video describing the hypothesized method of action of Chloroquine. Chloroquine opens up receptors on the cell membrane to allow Zinc to enter cells - Zinc interfers with the replication of sars-cov-2. So, take Zinc supplements to increase general Zinc levels in plasma/tissue and let in Zinc with Chloroquine.
An alternative proposed method of action for Chloroquine is that it binds to proteins created by sars-cov-2 (ORF3a, ORF10, ORF8). Those ORF proteins bind to heme (red in red blood cells), preventing oxygen from being transported -
https://twitter.com/davidasinclair/status/123897208275664896...
David Sinclair based his tweets on this paper:
https://chemrxiv.org/articles/COVID-19_Disease_ORF8_and_Surf...
But most organizations are going with the Zinc theory of Chloroquine. So take Chloroquine with Zinc supplements (France, South Korea, China are doing clinical trials).
Here is a translation of a Chinese study intermediate results - no data was released, which makes some people sceptical:
https://twitter.com/jim_dowling/status/1239255793171660800
Here is a great summary of available treatments used in different countries
https://epidemio.wiv-isp.be/ID/Documents/Covid19/COVID-19_In...
Although untested in-vivo, many clinicians prefer hydroxycholorquine due to its superior safety profile - and 4X better efficacy in-vivo (not in humans, in cells). I tried ordering that last week when the paper came out, not sure if i will get it, though.
Chloroquine is kind of old news. There has been a lot of talk around Chloroquine, starting around 6 weeks or so ago - the UK banned export of it nearly 4 weeks ago https://www.pharmaceutical-technology.com/comment/parallel-e.... I managed to order some before that.
References:
"Chloroquine Is a Zinc Ionophore"
https://journals.plos.org/plosone/article?id=10.1371/journal...