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  • Title: Diskus and diskhaler: efficacy and safety of fluticasone propionate via two dry powder inhalers in subjects with mild-to-moderate persistent asthma.
    Author: Galant SP, van Bavel J, Finn A, Gross G, Pleskow W, Brown A, Hamedani AG, Harding SM.
    Journal: Ann Allergy Asthma Immunol; 1999 Mar; 82(3):273-80. PubMed ID: 10094218.
    Abstract:
    BACKGROUND: Fluticasone propionate is a topically active glucocorticoid with potent antiinflammatory activity in the treatment of asthma. OBJECTIVE: This study evaluated the safety and efficacy of fluticasone propionate administered via the Diskus and Diskhaler powder delivery devices in subjects with mild-to-moderate asthma. METHODS: Fluticasone propionate (500 microg twice daily) or placebo was administered via the Diskus and Diskhaler to 213 adolescent and adult asthma subjects in a randomized, double-blind, double-dummy, parallel-group study for 12 weeks. Subjects were stratified according to baseline therapy of inhaled corticosteroids or beta2-agonists alone. Subjects were dropped from the study if they met predefined criteria for lack of efficacy. RESULTS: Fluticasone propionate improved pulmonary function both in subjects previously treated with inhaled corticosteroids or beta2-agonists alone. At endpoint, fluticasone propionate significantly improved forced expiratory volume in 1 second (P < .001), morning and evening peak expiratory flow (P < .001), and asthma symptom scores (P < or = .016), and significantly reduced nighttime awakenings (P = .016; Diskhaler group only) and rescue albuterol use (P < .001). Overall, efficacy measurements for the Diskus and Diskhaler were similar. More placebo-treated subjects (34%) withdrew from the study due to lack of efficacy than subjects in the Diskus (5%) or Diskhaler (5%) groups. The incidence and severity of adverse events were similar across groups. Measurement of plasma fluticasone propionate and cortisol concentrations showed no apparent influence of device on systemic exposure. CONCLUSION: Fluticasone propionate powder, administered via the Diskus or Diskhaler inhalation devices, was well tolerated and effective in the treatment of mild-to-moderate persistent asthma.
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