A randomized phase III trial of adjunctive zonisamide in pediatric patients with partial epilepsy

Renzo Guerrini, Anna Rosati, Joanna Segieth, Simona Pellacani, Kate Bradshaw, Luigi Giorgi

Research output: Contribution to journalArticlepeer-review


Purpose To assess the efficacy and safety/tolerability of adjunctive zonisamide treatment in pediatric patients with partial epilepsy. Methods In this phase III, double-blind, randomized, placebo-controlled, multicenter trial, 207 patients (age 6-17 years) with partial epilepsy, receiving one or two antiepileptic drugs, were randomized to receive adjunctive zonisamide or placebo. Zonisamide was initiated at 1 mg/kg/day, titrated to a target dose of 8 mg/kg/day over 8 weeks (one down-titration permitted), and maintained for 12 weeks. The primary efficacy end point was the proportion of responders (≥50% seizure frequency reduction from baseline) during the 12-week maintenance period. Safety/tolerability assessments included the incidence of treatment-emergent adverse events (TEAEs). Key Findings In total, 93 (86.9%) of 107 patients randomized to zonisamide and 90 (90.0%) of 100 patients randomized to placebo completed the trial. Responder rates were 50% for zonisamide versus 31% for placebo (p = 0.0044; intention-to-treat population, last observation carried forward). The overall incidence of TEAEs was similar for zonisamide (55.1%) versus placebo (50.0%), with low rates of serious TEAEs with zonisamide and placebo (3.7% vs. 2.0%) and TEAEs leading to withdrawal (0.9% vs. 3.0%). TEAEs reported more frequently with zonisamide versus placebo were decreased appetite (6.5% vs. 4.0%), decreased weight (4.7% vs. 3.0%), somnolence (4.7% vs. 2.0%), vomiting (3.7% vs. 2.0%), and diarrhea (3.7% vs. 1.0%). Significance Adjunctive zonisamide treatment was shown to be effective and well tolerated in pediatric patients with partial epilepsy. No new or unexpected safety findings emerged.

Original languageEnglish
Pages (from-to)1473-1480
Number of pages8
Issue number8
Publication statusPublished - Aug 2013


  • Adjunctive treatment
  • Antiepileptic drugs
  • Partial epilepsy
  • Partial seizures
  • Pediatric epilepsy
  • Zonisamide

ASJC Scopus subject areas

  • Clinical Neurology
  • Neurology


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