Chloroquine is a quinoline compound, which is a white, odorless, crystalline substance and freely soluble in water. It is predominantly an antimalarial drug. Its chemical formula is C18H26ClN3 and the molecular weight is 319.872 g/mol, with an elimination half-life of 1 to 2 months. The exact mechanism of Generic Aralen (chloroquine) in treating and preventing malaria is unknown. However, studies have found that the drug keeps the malarial parasite from entering the red blood cells, preventing malarial infection.