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How It Works. Leflunomide (Arava) is a disease-modifying antirheumatic drug (DMARD) that is used to treat rheumatoid arthritis. It interferes with the progression of the disease by blocking the production of white blood cells that cause the joint inflammation in rheumatoid arthritis.
Leflunomide comes as a tablet to take by mouth. It is usually taken once a day. Your doctor may tell you to take a larger dose of leflunomide for the first 3 days of treatment. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take leflunomide exactly as directed.