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Do chloroquine phosphate or hydroxychloroquine help fight coronavirus?
Based on the available data, hydroxychloroquine is not an effective treatment for the coronavirus.
The experiments suggesting that chloroquine phosphate and a related compound hydroxychloroquine might be effective against COVID-19 were mostly done "in vitro," meaning experiments done in the test tube and not in humans.
It is important to note that chloroquine phosphate and hydroxychloroquine can be toxic, and should not be used unless prescribed by a doctor. There have been several reports of individuals trying to self-medicate and dying from "chloroquine poisoning."
Drafted 27 May 2020