The use and complications of intravenous cyclophosamide, azathioprine, nitrogen mustard, and cyclosporine are reviewed. Studies have failed to demonstrate superiority of intravenous versus oral cyclophosphamide in rheumatic diseases other than systemic lupus. Azathioprine is a useful immunosuppressive agent in Beccedil;het's disease. Further studies of cyclosporine in rheumatoid arthritis indicate that efficacy and toxicity are both dose related.
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