Join Britannica's Publishing Partner Program and our community of experts to gain a global audience for your work! Chloroquine, introduced into medicine in the 1940s, is a member of an important series of chemically related antimalarial agents, the quinoline derivatives. Chloroquine is administered orally as chloroquine phosphate. How plaquenil works for sjogrens Chloroquine volume of distribution Plaquenil cognitive side effects Medical Definition of chloroquine. an antimalarial drug administered in the form of its diphosphate C 18H 26ClN 3 2H 3PO 4 or hydrochloride C 18H 26ClN 3 HCl. Chloroquine phosphate, given orally, is a drug used for the prevention and treatment of uncomplicated cases of malaria, which is caused by species of Plasmodium. In regions where chloroquine-resistant P. falciparum is encountered, mefloquine or doxycycline may be used for prevention of the disease. It can also decrease symptoms and future complications. Plaquenil hydroxychloroquine is a good choice for people who have difficulty tolerating newer biologic medications. A generic form of Plaquenil hydroxychloroquine is available. chloroquine is generally safe to use during pregnancy and for children. Chloroquine is effective against susceptible strains of the malarial parasites , as well as certain parasitic worms and amoebas. It also can be given by intramuscular injection as chloroquine hydrochloride. What is in chloroquine Chloroquine MedlinePlus Drug Information, Chloroquine drug Britannica Hydroxychloroquine dosage 200 mgNivaquine p chloroquine phosphate Mar 19, 2020 Chloroquine, an old malaria drug, may help treat novel coronavirus, doctors say Chloroquine, or hydroxychloroquine, has been used to treat malaria since 1944. Chloroquine, an old malaria drug, may help treat novel.. Compare Plaquenil vs Chloroquine -. Chloroquine Alternatives & Similar Drugs -. Chloroquine also known as chloroquine phosphate is an antimalarial medicine. It is available in the. United States by prescription only. It is sold under the brand name Aralen, and it is also sold as a generic medicine. It is available in tablets of two sizes 150mg base 250mg salt and 300mg base 500mg salt. Chloroquine is used to prevent and treat malaria. It is also used to treat liver infection caused by protozoa extraintestinal amebiasis. Chloroquine belongs to a group of medicines known as antimalarials. It works by preventing or treating malaria, a red blood cell infection transmitted by the bite of a mosquito. Chloroquine, brand name Aralen, is an anti-malarial drug. It is similar to hydroxychloroquine Plaquenil, and is useful in treating several forms of malaria as well as amebiasis that has spread outside of the intestines.