• Lucy Croyle and Eric F Morand.
• Centre for Inflammatory Diseases, Monash University School of Clinical Sciences, Melbourne, Victoria, Australia.
• Int J Rheum Dis. 2015 Feb 1; 18 (2): 129-37.

AbstractThe management of systemic lupus erythematosus (SLE) is complicated by heterogeneous clinical presentations, a lack of universally accepted tools for the measurement of disease activity and a lack of powerful, safe, specific targeted therapies. Current medical treatment of disease activity relies on glucocorticoids as well as agents including hydroxychloroquine (HCQ), mycophenolate mofetil (MMF) azathioprine (AZA), and less frequently cyclophosphamide. These agents are generally used in fixed, weight-based dosing regimens, and both incomplete response and adverse effects are common. An emerging literature in SLE and other inflammatory diseases in which these drugs are used suggests that improved patient outcomes could be achieved through a different approach to their use. Measurement of drug or metabolite concentrations has been shown in a number of studies to identify under- and over-dosing, predict efficacy and detect non-adherence to therapy, with positive associations between optimum drug or metabolite levels and improved outcomes. In this paper, we will review the literature regarding the measurement of HCQ, MMF, AZA and cyclophosphamide drug and metabolite levels in SLE and inflammatory disease, and make recommendations for future research that could facilitate improved outcomes for patients with SLE. © 2015 Asia Pacific League of Associations for Rheumatology and Wiley Publishing Asia Pty Ltd.

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