High prevalence of potential drug-drug interactions for psoriasis patients prescribed methotrexate or cyclosporine for psoriasis: associated clinical and economic outcomes in real-world practice

Dermatology : International Journal for Clinical and Investigative Dermatology
Jean-Hilaire SauratParvez M Mulani

Abstract

Methotrexate (MTX) and cyclosporine (CYC) may adversely interact with common medications in patients with psoriasis. Our purpose was to investigate the prevalence and outcomes of MTX/CYC polypharmacy. We evaluated rates of events that may be associated with drug-related toxicity, health care resource utilization and costs for patients with psoriasis in the Ingenix(R) Impact National Managed Care Database (1999-2007) who were exposed or not exposed to potential drug-drug interactions. Among 4,583 (57.6%) exposed and 3,372 (42.4%) nonexposed patients, nonsteroidal anti-inflammatory drugs and antibiotics were the most common drugs with potential interactions. The exposed patients had significantly greater risks of developing renal [adjusted odds ratio (OR): 2.58; p = 0.0145], gastrointestinal (OR: 1.36; p = 0.0197) and pulmonary events (OR: 1.20; p = 0.0470), and significantly greater health care resource utilization (e.g. OR for inpatient and emergency department visits: 1.47; p < 0.0001) and costs (adjusted incremental cost: USD 1,722; p < 0.0001). MTX/CYC polypharmacy is prevalent in patients with psoriasis and associated with significant risks.

Citations

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