Hydroxychloroquine is available as the brand-name drug Plaquenil. Generic drugs usually cost less than the brand-name version. Hydroxychloroquine may be used as part of a combination therapy. Arthritis medicine plaquenil Plasmodium resistance to chloroquine The action of hydroxychloroquine is cumulative and may require weeks to months to achieve the maximum therapeutic effect see CLINICAL PHARMACOLOGY. Mechanism of Action Immune modulator. Hydroxychloroquine, an alkylated 4-aminoquinoline, is a hydroxylated form of chloroquine and has a biological mechanism of action similar to chloroquine’s. Hydroxychloroquine was originally developed as a safer alternative to chloroquine for the treatment of malaria and was later found to have. A metabolite of chloroquine – hydroxychloroquine – has a long half-life 32–56 days in blood and a large volume of distribution 580–815 L/kg. The therapeutic, toxic and lethal ranges are usually considered to be 0.03 to 15 mg/l, 3.0 to 26 mg/l and 20 to 104 mg/l, respectively. Hydroxychloroquine is used to treat lupus erythematosus and rheumatoid arthritis. It isn’t fully understood how this drug works to treat lupus erythematosus or rheumatoid arthritis. That means you may need to take it with other drugs. It treats malaria by killing the parasites that cause the disease. Hydroxychloroquine mechanism of action ra Hydroxychloroquine From Malaria to Autoimmunity., Hydroxychloroquine Information for Providers AIDSinfo Uptodate hydroxychloroquine PREGNANCY AND LACTATION. Hydroxychloroquine is considered safe in all trimesters of pregnancy. Due to the high risk of flare in systemic lupus erythematosus when discontinuing this medication, continued Plaquenil use is advised in these patients during pregnancy. Small amounts of hydroxychloroquine can be found in breastmilk. Hydroxychloroquine Plaquenil RheumTutor. Chloroquine - Wikipedia. Hydroxychloroquine Plaquenil. The mechanisms of action of hydroxychloroquine and chloroquine remain under continuous study in modern molecular medicine 17,18 using advanced tools in computational biology 19, synthetic biology. The exact mechanism of action for hydroxychloroquine and another antimalarial drug chloroquine in RA is not known, but researchers think these drugs decrease production of a number of different chemicals that are important to the immune response. 3. What are the possible side effects of hydroxychloroquine? Hydroxychloroquine. In RA, hydroxychloroquine is designed to interfere with the interaction between T helper cells and antigen-presenting macrophages that cause joint inflammation and decrease the.