As nice as it would be for a wonder drug you just
happen to own to magically end the COVID-19 outbreak,
the NYTimes reports that another study into the anti-malarial was stopped, because the patients' heartbeats started going wonky to the point the doctors said "If we keep this up, they'll get worse or
die. As doctors, we're not allowed to do that, and also as human beings, we wouldn't want to,
that's just common sense." In Portuguese. Because the study was in Brazil.
This isn't a movie or TV show, people. We don't just
happen to have vast reserves of a pill that just
happens to cure the plague on its first try with no side effects. Even if chloroquine turns out to be useful in treatment, there are still other factors in play, such as proper dosage and drug interactions.