Can epilepsy and seizure medications affect my fertility?

Question

Hello doctor,

I am a 28-year-old woman diagnosed with epilepsy three years ago, and I am currently on medication that seems to control my seizures well. However, I am planning to start a family with my husband, and I have so many concerns about how this will affect my pregnancy and my future children. My neurologist mentioned that some seizure medications can affect birth control effectiveness, and I have been using the pill for contraception.

I have also noticed that my seizures seem to get worse around my menstrual cycle. They are more frequent about a week before my period starts. Additionally, I have been experiencing irregular periods since starting my epilepsy medication, and I am worried this might affect my fertility. My sister had gestational diabetes during her pregnancy, so I am also concerned about managing multiple health conditions if I do get pregnant.

How do hormonal changes during my menstrual cycle affect seizure frequency and severity?
Can my current seizure medication affect the effectiveness of birth control pills?
What seizure medications are safest during pregnancy, and should I switch before trying to conceive?
How might epilepsy and seizure medications affect my fertility and menstrual regularity?
What special monitoring would I need during pregnancy with epilepsy?
Are there increased risks for gestational diabetes or other pregnancy complications with epilepsy?

Please suggest.

Thank you.

Answer 1

Hello,

Welcome to icliniq.com.

I have read your query and can understand your concern.

Here is a structured breakdown of your concerns.

In hormonal changes and seizure frequency, many women with epilepsy notice more seizures in the luteal phase (about a week before their period) due to hormonal shifts. Low progesterone and fluctuating estrogen can make brain cells more excitable. This pattern is called catamenial epilepsy and can sometimes be improved with medication timing adjustments or hormonal strategies.

In birth control effectiveness and seizure medication, some antiseizure drugs, especially enzyme-inducing AEDs (anti-epileptic drugs) like Carbamazepine, Phenytoin, Phenobarbital, and Topiramate (at higher doses), can reduce the effectiveness of birth control pills. If you are on one of these, your neurologist may recommend non-hormonal contraception (e.g., copper IUD (intrauterine device) or higher-dose estrogen pills with backup protection.

The safest seizure medications in pregnancy are Lamotrigine and Levetiracetam. These are generally considered safest in terms of fetal development. Valproate should be avoided if possible, as it carries a high risk of birth defects and developmental issues. If switching is needed, it is best to do this at least six to twelve months before conception so your seizure control is stable.

In case of fertility and menstrual cycle effects, some seizure medications (especially Valproate) can cause menstrual irregularities or polycystic ovary syndrome (PCOS), which can affect fertility. Seizure activity, stress, and medication effects can disrupt reproductive hormones.

During pregnancy monitoring, a higher dose of folic acid (4 to 5 mg/day) starting before conception is required to reduce neural tube defects. Drug level monitoring is required, as pregnancy can lower medication levels, risking breakthrough seizures. Close neurologist and obstetric follow-up is ideally needed with a high-risk OB (obstetric cases). Regular ultrasounds are required to monitor fetal growth.

In case of pregnancy complications, women with epilepsy have a slightly higher risk of gestational diabetes, high blood pressure, and preterm birth, partly from medication effects and partly from the condition itself. Your sister’s history of gestational diabetes also means you should be screened early and possibly more than once during pregnancy.

Before trying to conceive, review your current AED with your neurologist to ensure it is pregnancy-safe. Start high-dose folic acid now. Discuss alternative contraception if you are on an enzyme-inducing drug. Keep a seizure diary, noting cycle pattern. This may guide medication adjustments for catamenial seizures. Arrange a preconception consultation with a neurologist and maternal-fetal medicine specialist.

I hope this answers your query.

Let me know if I need to assist you further.

Thank you.