5. Are currently being treated with stable doses of one to a maximum of three AEDs for at least 4 weeks prior to Visit 1 and throughout the study duration (Only one perampanel inducing AED [i.e. carbamazepine, oxcarbazepine, phenytoin] out of the maximum of 3 AEDs is allowed in at least one third of the participants in each age cohort and not to exceed one half of the population of each age cohort. The remaining participants should not be taking any inducer)