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Epilepsy requiring ongoing medical treatment is the most common neurologic disorder in pregnancy [1]. Data from a number of population-based studies estimate that maternal epilepsy is present in 0.3–1% of all pregnancies [2–7], the vast majority representing women with preexisting epilepsy, and a minority (2–10%) representing women with new-onset epilepsy during pregnancy [8, 9]. The incidence of antiseizure medication (ASM) use is estimated at 0.3–0.4% of all pregnancies, which includes those who are maintained on ASMs for neuropsychiatric disorders such as bipolar and schizoaffective disorders, a practice that has become more common in the past two decades [3–5, 10, 11].