It can decrease the pain and swelling of arthritis. It may prevent joint damage and reduce the risk of long-term disability. Does taking plaquenil cause hair loss What is plaquenil made of Hydroxychloroquine is used to treat or prevent malaria, a disease caused by parasites that enter the body through the bite of a mosquito. Malaria is common in areas such as Africa, South America, and Southern Asia. This medicine is not effective against all strains of malaria. Feb 29, 2020 It belongs to a disease-modifying antirheumatic drug classification. Hydroxychloroquine can reduce the skin problems linked with lupus and prevent the pain and swelling brought on by arthritis. This medication may also be used to treat other infections such as Q fever endocarditis, a type of heart valve infection. Hydroxychloroquine is in a class of drugs called antimalarials. It is used to prevent and treat acute attacks of malaria. It is also used to treat discoid or systemic lupus erythematosus and rheumatoid arthritis in patients whose symptoms have not improved with other treatments. Today, it is used to treat rheumatoid arthritis, some symptoms of lupus, childhood arthritis (or juvenile idiopathic arthritis) and other autoimmune diseases. Hydroxychloroquine is in a class of medications that was first used to prevent and treat malaria. What is in hydroxychloroquine What is Hydroxychloroquine? - HTQ, What Is the Difference between Hydroxychloroquine and. Is plaquenil a disease modifying The antimalarial drug chloroquine, and its derivative, hydroxychloroquine, are also candidates for COVID-19 treatments. Researchers first began testing their ability to halt the spread of viruses. Is Hydroxychloroquine the Answer to the Coronavirus.. Hydroxychloroquine MedlinePlus Drug Information. Hydroxychloroquine - Wikipedia. Hydroxychloroquine is a 4-aminoquinoline with immunosuppressive, antiautophagy, and antimalarial activities. Although the precise mechanism of action is unknown, hydroxychloroquine may suppress immune function by interfering with the processing and presentation of antigens and the production of cytokines. Medical Definition of hydroxychloroquine. a drug derived from quinoline that is administered orally in the form of its sulfate C 18H 26ClN 3OH 2SO 4 to treat malaria, rheumatoid arthritis, and lupus erythematosus — see plaquenil. The drug's full name is hydroxychloroquine, and is sold in the US under the brand name Plaquenil. It was approved in the 1950’s as an anti-malaria treatment.