How long does it take for a child's Keppra withdrawal symptoms to go away?

Good evening, Thank you for these details. If I understand correctly, your son had become aggressive possibly due to the Keppra, and despite the decrease in dose, the aggressiveness remains. It would be necessary to see the neurologist again to see if the Keppra was really the cause (or the only cause). You should also know that the medication is already balanced in his blood and that the symptoms you describe should not be associated with withdrawal symptoms. We look forward to seeing you.