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Oh, Shin J.; Shcherbakova, Natalya; Kostera-Pruszczyk, Anna; Alsharabati, Mohammad; Dimachkie, Mazen; Munoz Blanco, Jose; Brannagan, Thomas; Lavrnic, Dragana; Shieh, Perry B.; Vial, Christophe; Meisel, Andreas; Komoly, Samuel; Schoser, Benedikt; Sivakumar, Kumaraswamy and So, Yuen (2016): Amifampridine phosphate (Firdapse((R))) is effective and safe in a phase 3 clinical trial in LEMS. In: Muscle & Nerve, Vol. 53, No. 5: pp. 717-725

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Abstract

ObjectiveWe evaluated the efficacy and safety of amifampridine phosphate (Firdapse((R))) for symptomatic treatment in Lambert-Eaton myasthenic syndrome (LEMS). MethodsPhase 3, randomized, double-blind, study. Patients were treated initially with amifampridine phosphate for 7-91 days, followed by randomization to continue amifampridine phosphate for 14 days or placebo (7-day taper, 7-day placebo). The primary efficacy endpoints were changes from baseline at day 14 in Quantitative Myasthenia Gravis and Subject Global Impression scores. ResultsThe coprimary efficacy end points and 1 of the secondary efficacy end points were met, showing a significant benefit of aminfampridine phosphate over placebo at Day 14. All 5 primary, secondary, and tertiary endpoints achieved statistical significance at Day 8. Amifampridine phosphate was well tolerated;the most common adverse events were oral and digital paresthesias, nausea, and headache. ConclusionsThis study provides Class I evidence of efficacy of amifampridine phosphate as a symptomatic treatment for LEMS. Muscle Nerve53: 717-725, 2016

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