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French, J A; Costantini, C; Brodsky, A; von Rosenstiel, P
"Adjunctive brivaracetam for refractory partial-onset seizures: a randomized, controlled trial"
Neurology 2010 Aug 10; 75(6):519-525
OBJECTIVE: To explore efficacy and safety/tolerability of adjunctive brivaracetam (BRV), a novel, high-affinity synaptic vesicle protein 2A ligand, which also inhibits neuronal voltage-dependent sodium channels, in patients with refractory partial-onset seizures (POS). METHODS: This was an exploratory, phase IIb, double-blind, randomized, parallel-group, placebo-controlled, dose-ranging study in patients 16-65 years with epilepsy experiencing > or =4 POS during 4-week baseline despite 1-2 concomitant antiepileptic drugs. Patients were randomized (1:1:1:1) to placebo, BRV 5 mg/day (BRV5), BRV 20 mg/day (BRV20), or BRV 50 mg/day (BRV50), administered BID without uptitration during a 7-week treatment period. Primary efficacy endpoint was POS frequency/week during the treatment period relative to placebo. RESULTS: A total of 208 patients constituted the intention-to-treat population; 197 completed the study. Estimated percentage reductions over placebo in POS frequency/week were 9.8% (BRV5; p = 0.240), 14.9% (BRV20; p = 0.062), and 22.1% (BRV50; p = 0.004). Median percent reductions from baseline in POS frequency/week were 21.7% (placebo), 29.9% (BRV5; p = 0.086), 42.6% (BRV20; p = 0.014), and 53.1% (BRV50; p < 0.001); > or =50% responder rates were 16.7% (placebo), 32.0% (BRV5; p = 0.047), 44.2% (BRV20; p = 0.002), and 55.8% (BRV50; p < 0.001); seizure freedom rates (POS) during the 7-week treatment period were 1.9% (placebo), 8.0% (BRV5; p = 0.193), 7.7% (BRV20; p = 0.193), and 7.7% (BRV50; p = 0.201). BRV was well-tolerated. Most adverse events were mild to moderate and occurred with similar incidence in placebo and BRV groups, and discontinuations due to treatment-emergent adverse events were infrequent (placebo 3.7%; BRV 2.6%). CONCLUSIONS: This interventional study provides preliminary Class I evidence that adjunctive BRV was efficacious and well-tolerated in patients aged 16-65 years with POS

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