Hydroxychloroquine (HCQ), sold under the brand name Plaquenil among others, is a medication used for the prevention and treatment of certain types of malaria.[2] Specifically it is used for chloroquine-sensitive malaria.[3] Other uses include treatment of rheumatoid arthritis, lupus, and porphyria cutanea tarda.[2] It is taken by mouth.[2] It is also being used as an experimental treatment for coronavirus disease 2019 (COVID-19).[4]