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  • Title: Epilepsy, Antiepileptic Drugs, and Adverse Pregnancy Outcomes, 2: Major Congenital Malformations With Antiepileptic Drug Monotherapy.
    Author: Andrade C.
    Journal: J Clin Psychiatry; 2024 Jul 03; 85(3):. PubMed ID: 38959494.
    Abstract:
    Women with epilepsy (WWE) are usually advised antiepileptic drug (AED) treatment even during pregnancy. It is therefore important to know what the major congenital malformation (MCM) risks might be with untreated epilepsy, and with first-trimester exposure to different AEDs in monotherapy. This article reviews recent findings from a large multinational registry, a large multinational population based study, and a large meta-analysis. In summary, data from the meta-analysis suggest that the MCM rate is 2%-3% in women without epilepsy and about 3% in WWE who were unexposed to AEDs during pregnancy. Data from the meta analysis also suggest that the MCM rate is approximately population level at 2.6%-3.5% with levetiracetam and lamotrigine and that it is about 4%-5% with carbamazepine, 2.8%-4.8% with oxcarbazepine, about 4% with topiramate, about 5%-7% with phenytoin, about 6%-9% with phenobarbital, and nearly 10% with valproate. The MCM risk with valproate is significantly higher than that with other AEDs (including topiramate and phenobarbital) that significantly increase the risk. Data from the registry suggest that risks are dose-dependent with valproate, phenobarbital, and carbamazepine and that the risk with valproate may be as high as 25% at doses >1,450 mg/d. Valproate is also associated with a wide range of MCMs. Data from the population-based study were generally confirmatory. Strengths and limitations of the studies are considered. The findings of these studies encourage the consideration of levetiracetam or lamotrigine monotherapy for WWE who are pregnant and strongly discourage the consideration of the older AEDs, especially phenytoin and phenobarbitone, and most especially valproate. These considerations also apply to all WWE of childbearing age because it may not be easy to change AEDs when pregnancy is planned and because pregnancy is often unplanned.
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