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Cyran on 23 April 2020
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Lafiel said:
JRPGfan said:

France first believed it worked (they tried it on very mild cases, who recovered faster).
New study shows it doesnt (when used on people with symptoms, hospitalised).

China tried it, reported it doesnt work.
Brazil tried it, reported it doesnt work, and increased mortality rate (people had heart attacks)
US tried it, used on military vets, noticed increased mortality rate.

So far, its been tried a few places (probably more than these 4) and non of the places kept on useing it.

It appears it doesnt work (for covid19).

The drug itself was worth a closer inspection, because it has several mechanisms (not all of which are well understood) how it can inhibit virus reproduction and it has shown so in in vitro tests. But it seems the dose needed to reach high enough (Hydroxy-)Chloroquine concentrations in cells/tissue targeted by SARS-CoV-2 - especially in the middle/later stages of the illness - is too much for the body/the heart to handle. Additionally there now is good evidence that targeted tissue is present in many organs including the heart, so treatment with a drug that can negatively affect the heart function seems too risky in critical cases.

There still might be a "golden window" in the earlier stages of the disease, when not as many virus particles are around, in which more tolerable doses of HQC/QC could be effective in lowering the amount of successful reproductions. Maybe that's what the first (limited, not peer reviewed) study picked up on.

Let me be clear from my last statement, I am in no way saying it a cure but rather it may be useful in treatment in some cases and that it worth further study.  As Lafiel said it seem the usefulness window is most likely only in the early stages and not useful if you do not find out you have it till you already in the later stages.  

In this video as 22min and 27 secound

https://www.youtube.com/watch?v=EFRwnhfWXxo&list=PLQ_IRFkDInv-NvRRUN0aqe51sMs188k8z&index=16&t=0s

He talked about a study out that using hydroxychloroquine with azithromycin has shown promising results when used in the early stage of contagion. 

My only point was that while it most defiantly not a magic cure that don't mean that under the right situations hydroxychloroquine  cant be useful for treating some patients and it still worth letting the scientist continue to do the studies and see what they find.