ObjectiveA meta-analysis of published studies was performed to determine whether the efficacy of antiseizure drugs in adults with primary generalized tonic-clonic seizures (PGTCS) is comparable with that in the pediatric population (2-12 years of age).MethodsElectronic searches were conducted in EMBASE, Medline, and the Cochrane Central Register of Controlled Trials for clinical trials of PGTCS in adults and children 2-12 years of age. Neurologists used standardized search and study evaluations to select eligible trials. Median percent reduction in seizure frequency from baseline and ≥50% responder rates were used to compare drug efficacy in adults and children.ResultsAmong 7 adjunctive-therapy PGTCS trials in adults and children (2-12 years of age) that met evaluation criteria, effect sizes were consistent between adults and children for lamotrigine and topiramate. The baseline-subtracted median percent seizure reduction in seizure frequency ranged from 50.0% to 79.7% in children and 57.0% to 64.0% in adults. The ≥50% responder rate was similar between children and adults in a topiramate study (50% in children compared with 58% in adults).ConclusionsThis meta-analysis supports the use of drug response from antiseizure drug clinical trials for PGTCS in adults to predict comparable treatment response in children 2-12 years of age with PGTCS.