Coronavirus and chloroquine – does it work?

There has been a global surge in demand for drugs normally used against malaria to tackle the coronavirus, as governments urgently seek treatments for the new disease.

Chloroquine, and a related derivative, hydroxychloroquine, have gained attention, although the World Health Organization (WHO) says there’s no definitive evidence they work.

There have also been reports of serious side effects.

So what is the current evidence of their effectiveness and who is using them?

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