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Chloroquine prevents the development of malaria parasites in the blood. Doctors use it to both prevent and treat malaria. Chloroquine does not destroy the Plasmodium (P.)vivax and P. ovale parasites that may remain in the liver.
To prevent some strains of malaria, you take chloroquine once, 1 to 2 weeks prior to travel to an area where malaria is present, and then weekly while you are in the area, and weekly for 4 weeks after you depart from the area.
To treat malaria, you take chloroquine at several-hour intervals and at a higher dosage than when it's taken to prevent malaria.
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