<prompt> Chloroquine is useful in:Discoid lupus erythematosisRheumatoid arthritisInfectious mononucleosisAll of the above  <response>: HydroxychloroquineHydroxychloroquine is used for early, mild RA, often combined with methotrexate. This agent is also used in the treatment of lupus and malaria. Its mechanism of action in auto-immune disorders is unknown, and onset of effects takes 6 weeks to 6 months.Monotherapy may be initiated with any of the DMARDs methotrexate, leflunomide, hydroxychloroquine or sulfasalazine for patients with low disease activity.DMARDs Disease modifying Anti-Rheumatic Drugs.Reference: Lippincott Illustrated Reviews: Pharmacology Wolters Kluwer Sixth Edition page no 457,458 