Enzyme-inducing antiseizure drugs taken concomitantly with perampanel are known to influence perampanel serum concentrations. In this study, we examined perampanel dosage, serum concentrations, and the effect of concomitant enzyme-inducing antiseizure drugs in children for a 3-year period. A retrospective chart review determined patient age, weight, perampanel serum concentration and prescribed dose, and concomitant drugs. Of 87 patients included in the study, 41 were prescribed an enzyme-inducing antiseizure drug. Although perampanel dosage did not differ between patients prescribed/not prescribed enzyme-inducing antiseizure drugs, serum concentrations were significantly lower in patients taking enzyme-inducing antiseizure drugs (average serum concentration for the enzyme-inducing antiseizure drug group was still above the previously reported efficacious serum concentration of 70 ng/mL). Although perampanel serum concentrations are negatively influenced by enzyme-inducing antiseizure drugs in children, it is likely that efficacy would be improved in patients not concomitantly prescribed enzyme-inducing antiseizure drugs because pediatric perampanel dosing is similar to that reported in prior adult efficacy trials.

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