Originally created for Ebola, remdesivir is not approved globally for any human condition yet but works using in vitro and in vivo animal models. It can stop a virus from multiplying so it was tried against SARS, MERS, and SARS-CoV-2 coronaviruses and it succeeded. After case studies also reported benefit in severely ill COVID-19 patients, clinical trials started.
But clinical trials require placebo and it has no safety issues so it makes more sense for FDA to allow it under Compassionate Use and get real data that way. A recent study also showed it didn't require 10 days to help.
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