Clinical efficacy of zonisamide in Lennox-Gastaut syndrome: Korean multicentric experience.

PURPOSE: To evaluate the efficacy and safety of zonisamide (ZNS) as long-term adjunctive therapy in children with Lennox-Gastaut syndrome (LGS).

METHOD: We evaluated the seizure frequency, cognitive outcomes, and side effects of 62 LGS patients maintained on ZNS for at least 12 months in three tertiary centers.

RESULTS

Of the 62 LGS patients maintained on ZNS, 3 (4.8%) had 100% seizure control; 14 (22.6%) had >75% to <100% reduction in seizure frequency; 15 (24.2%) had >50% to <75% reduction in seizure frequency; 6 (9.7%) had >0% to <50% reduction in seizure frequency, and 24 (38.7%) had no seizure reduction. Seizure outcomes were not related to seizure types or etiologies. Adverse events included somnolence and anorexia, but all were transient and successfully managed by careful follow-up.

CONCLUSION

Our results indicate that adjunctive treatment with ZNS is safe and effective in pediatric LGS patients.