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> ... there seems to be little harm in trying it [...] if Drs want to used an already fda approved drug ...

All drugs have side effects, for example https://www.webmd.com/drugs/2/drug-5482/hydroxychloroquine-o... So each drug is a (small) risk for the patient. The idea of testing the drugs in RCT before using in the patients in the wild is that you can be quite sure that the benefits are greater than the risks.

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