Major malformations in offspring of women with epilepsy

CEU; Collaborative Management of Women with Bipolar Disorder During Pregnancy and Postpartum: Pharmacologic Considerations

Bipolar disorder is a chronic condition characterized by periods of mania, depression, or mixed states (co-occurring mania and depression). The postpartum period is associated with a high risk for symptom relapse or intensification, which can be reduced with the use of medications. Abrupt discontinuation of these medications increases the probability of relapse, which is associated with high-risk behaviors, significant family dysfunction, and suicide. Drugs used to treat patients with bipolar disorder vary in teratogenic potential. Although first trimester lithium use is associated with Ebstein's anomaly, the risk was overestimated in the past. Valproate and its derivatives and carbamazepine are human teratogens. Lamotrigine does not negatively impact major reproductive outcomes, but the data are limited. Typical antipsychotic medications are relatively well studied and the data do not identify major morphologic teratogenicity. There are fewer studies of newer atypical antipsychotic medications, and registries have been developed to collect prospective data. Clinical management of bipolar disorder during pregnancy, postpartum, and lactation requires a careful balancing of maternal and fetal risks and benefits. Communication and careful comanagement between the obstetric and psychiatric team is essential when treating women with bipolar disorder during the reproductive years.

Safety of the newer antiepileptic drug oxcarbazepine during pregnancy

OBJECTIVE

Seizure control in pregnant women with epilepsy is vital, as maternal seizures may have deleterious consequences. The treatment of pregnant women with epilepsy is, however, complicated by the teratogenicity of older antiepileptic drugs (AEDs). In this review, the safety of the newer AED oxcarbazepine during pregnancy is assessed based on published pregnancy outcome data. Other relevant safety issues, such as oxcarbazepine pharmacokinetics during pregnancy and the compatibility of oxcarbazepine treatment with breastfeeding, are also discussed.

METHODS

Literature searches of the following databases were performed: MEDLINE, EMBASE, eNova, NOWIMA (an internal Novartis Germany database), Derwent Drug File, SciSearch and BIOSIS. Identified publications were examined for original data reporting rates of foetal malformation following maternal exposure to oxcarbazepine as monotherapy or adjunctive therapy.

RESULTS

Relevant publications reporting data from the worldwide Novartis safety database and pregnancy registries or study centres in six countries were identified. A total of 248 pregnancies involving maternal exposure to oxcarbazepine monotherapy and 61 involving adjunctive therapy were reported. There were six malformations among the monotherapy group, equating to a malformation rate of 2.4% (6/248). The malformation rate reported in the general population is 2-4%. There were four malformations associated with oxcarbazepine adjunctive therapy, equating to a malformation rate of 6.6% (4/61).

CONCLUSIONS

This literature review suggests that, compared with newborns in the general population, the newborns of women receiving oxcarbazepine monotherapy during pregnancy do not appear to show an increased risk for malformations. However, the number of pregnancies involving maternal exposure to oxcarbazepine identified by this review is not sufficient to draw definitive conclusions. Additional information from large-scale pregnancy registries is required to confirm the safety profile of oxcarbazepine as monotherapy or adjunctive therapy during pregnancy.