An Antiseizure Drug in Pregnancy: Favoring Levetiracetam for Recurrent Seizure Control and Lamotrigine for Safety for Baby

Levetiracetam and lamotrigine are both antiseizure medications that can be used during pregnancy, but they have different profiles in terms of efficacy, safety, and the type of seizures they are best used for. When choosing an antiseizure medication for a pregnant woman, it's important to consider the specific needs of the patient, including the type of seizures, potential side effects, and the safety profile of the medication for both the mother and the fetus.

Levetiracetam (Keppra)

• Efficacy: Levetiracetam is effective for a wide range of seizure types, including focal seizures, tonic-clonic seizures, and myoclonic seizures. It is often used as an add-on therapy but can be used alone.
• Safety in Pregnancy: It is considered one of the safer options for use during pregnancy. Data suggest that the risk of major congenital malformations is not significantly increased with levetiracetam use during pregnancy compared to the baseline risk in the general population.
• Mechanism of Action: Works by inhibiting presynaptic calcium channels and may modulate neurotransmitter release, which helps to stabilize neuronal membranes and prevent seizure propagation.
• Considerations: Levetiracetam is generally well-tolerated. Common side effects include drowsiness, fatigue, and dizziness, but it does not typically cause the cognitive side effects associated with some other antiseizure medications.

Lamotrigine (Lamictal)

• Efficacy: Lamotrigine is particularly effective for treating focal seizures and generalized seizures, including absence seizures. It is also used for bipolar disorder, providing additional benefits for pregnant women with dual diagnoses.
• Safety in Pregnancy: Lamotrigine is considered one of the safer antiseizure medications for use during pregnancy. However, it requires careful management to avoid potentially harmful changes in plasma levels due to pregnancy-related alterations in drug metabolism. Monitoring and dose adjustments may be necessary.
• Mechanism of Action: Lamotrigine inhibits voltage-sensitive sodium channels, stabilizing neuronal membranes and inhibiting the release of excitatory neurotransmitters.
• Considerations: The risk of a rare but serious skin rash (Stevens-Johnson syndrome) is increased with lamotrigine, especially with rapid dose increases. Levels of lamotrigine can fluctuate significantly during pregnancy and the postpartum period, requiring close monitoring.

Making the Choice

When considering levetiracetam and lamotrigine for use in pregnancy, the choice depends on several factors:

• Type of Seizures: Both medications can be effective for different types of seizures, but the specific seizure type can influence the choice.
• Safety Profile: Both are considered relatively safe during pregnancy, with low risks of major congenital malformations. However, monitoring and possibly dose adjustments are important, especially for lamotrigine.
• Patient History: Previous response to medication, side effect profile, and any coexisting conditions (e.g., bipolar disorder for lamotrigine) can influence the choice.

In conclusion, both levetiracetam and lamotrigine are good options for managing seizures during pregnancy, offering a balance between efficacy and safety for the fetus. The decision should be made in consultation with a healthcare provider, considering the individual circumstances and needs of the pregnant woman. Monitoring throughout pregnancy is important to ensure the safety of both the mother and the fetus.