Chloroquine is a quinine analogue medication used to prevent and to treat malaria in areas where malaria is known to be sensitive to its effects.[1] Certain types of malaria, resistant strains, and complicated cases typically require different or additional medication.[1] Occasionally it is used for amebiasis that is occurring outside the intestines, rheumatoid arthritis, and lupus erythematosus.[1] It is taken by mouth.[1]