Synopsis
Integrate seizure control, fetal and parental reproductive safety, contraception interactions and pregnancy pharmacokinetics through planned specialist care while preventing abrupt antiseizure medicine withdrawal.
- Discuss pregnancy and contraception from the time antiseizure treatment is considered, because unplanned conception and interactions can occur years before someone volunteers a pregnancy intention.
- Refer anyone with epilepsy who is pregnant or planning pregnancy to an epilepsy specialist team and coordinate decisions with specialist obstetric, primary-care and pharmacy services.
- Do not stop antiseizure medicine abruptly after a positive pregnancy test; uncontrolled bilateral tonic-clonic seizures can harm both pregnant person and fetus, so changes require urgent specialist balancing.
Key red flags
New seizures can follow falling drug concentrations, vomiting, missed doses, sleep deprivation or pregnancy-specific pathology and need prompt multidisciplinary assessment rather than automatic dose escalation.
Investigation priorities
Confirm the indication and identify a safer effective regimen before pregnancy begins.
Management branches
A person with epilepsy could become pregnant or is planning pregnancy.
- 1. Refer early to epilepsy specialists, confirm seizure and syndrome diagnosis, and review control, prior drug failures, current dose and reproductive safety.
- 2. If a safer effective regimen is available, complete cautious cross-titration and demonstrate stability before stopping contraception or attempting conception.
Key medicines
Folic acidUK practice commonly prescribes 5 mg orally once daily before conception and until 12 weeks of pregnancy for people taking antiseizure medicines; confirm timing and duration in the current specialist plan.
Lamotrigine in pregnancyContinue the individually effective divided dose; obtain a preconception reference when monitoring is planned and adjust in specialist care against seizures and concentration change rather than a universal target.