- Chloroquine phosphate is commonly used to treat malaria and is very cheap
- Has been effective in treating against COVID-19 associated pneumonia
- Chloroquine was found to block COVID-19 infection at low molecular concentration
- In testing chloroquine phosphate and hydroxychloroquine from studies involving over 100 patients, the former has proved to be more effective in preventing the magnification of existing pneumonia

Princeton University

Summary of Breakthrough: Chloroquine phosphate has shown apparent
efficacy in treatment of COVID-19 associated pneumonia in
clinical studies 

Gao, J., Tian, Z., & Yang, X. (2020). Breakthrough: Chloroquine phosphate has shown apparent efficacy in treatment of COVID-19 associated pneumonia in clinical studies. Bioscience trends, 14(1), 72–73. https://doi.org/10.5582/bst.2020.01047

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