Chloroquine phosphate is a 4-aminoquinoline antimalarial drug, which can inhibit the nucleic acid synthesis of plasmodium fission, interfere with the growth and reproduction of plasmodium, and effectively kill plasmodium red internal stage fission.

Chloroquine phosphate can be used to treat falciparum, vivax and p. malariae which are sensitive to chloroquine.And can be used for the inhibition and prevention of malaria symptoms.Also can be used to treat intestinal amoebiasis, connective tissue disease, photosensitive diseases (such as erythema) and so on.

The national health commission has issued a statement that chloroquine phosphate, famivir, and a batch of proprietary Chinese medicines have antiviral activity.For example, chloroquine phosphate has shown excellent anti-novel coronavirus activity in vitro.