Hormones, Contraception & Pregnancy

Women’s health, hormones and reproductive care

Epilepsy care can change across puberty, menstrual cycles, contraception, fertility, pregnancy, birth, breastfeeding and menopause. Hormones can affect seizure patterns in some people, while antiseizure medicines can affect reproductive health, contraception and pregnancy in very different ways.

This page is the main gateway to the site’s dedicated women’s-health and reproductive-health guides. Use the sections below to go directly to the topic you need.

Important: do not stop or change antiseizure medication suddenly because of pregnancy or reproductive concerns. Uncontrolled seizures can also create serious risk. Medication changes should be planned with the epilepsy team.

Puberty, periods and hormone-related seizure patterns

Puberty and menstrual cycles can affect seizure patterns in some people, but not every change is caused by hormones. Sleep, missed medication, growth, stress and the epilepsy syndrome itself can all matter.

Puberty and Epilepsy — adolescence, sleep, seizure changes, medication responsibility and reproductive counselling.
Periods, Menstrual Changes and Epilepsy — irregular or absent periods, heavy bleeding, PCOS, endocrine effects and when menstrual changes need assessment.
Catamenial Epilepsy — repeated seizure worsening linked to particular phases of the menstrual cycle.

Contraception and antiseizure medicines

Some antiseizure medicines can make hormonal contraception less effective, while some contraceptives can alter antiseizure medicine concentrations. Lamotrigine and oestrogen-containing contraception are an especially important example of the interaction working in the opposite direction.

Antiseizure Medicines and Contraception — enzyme-inducing medicines, pills, implants, injections, IUDs/IUS, emergency contraception and lamotrigine interactions.

Fertility and planning pregnancy

Most people with epilepsy remain fertile. Fertility can nevertheless be influenced by menstrual disorders, PCOS, sexual function, some antiseizure medicines and male reproductive effects.

Fertility and Epilepsy — female and male fertility, valproate, IVF and assisted reproduction, fertility treatment and medicine interactions.
Preconception Planning, Folic Acid and Epilepsy — medication review, folic acid, baseline drug levels and preparing safely before conception.

Medicines with specific reproductive-safety restrictions

Pregnancy risk is not the same for every antiseizure medicine, and regulatory requirements differ between countries. WHO advises against valproate in women and girls of childbearing potential because of the risk of congenital malformations and neurodevelopmental harm, while regulators in the UK, European Union and other jurisdictions apply additional medicine-specific restrictions or pregnancy-prevention requirements. Topiramate also carries important pregnancy-related safety restrictions, but the exact rules and programme requirements depend on the country.

Valproate and Reproductive Safety — pregnancy risks, current UK restrictions, fertility, paternal exposure and Pregnancy Prevention Programme requirements.
Topiramate and Reproductive Safety — congenital and fetal-growth risks, possible neurodevelopmental risk and current UK Pregnancy Prevention Programme rules.

During pregnancy

Pregnancy can change antiseizure medicine clearance and seizure control. Some medicines, particularly lamotrigine and levetiracetam, may fall substantially in concentration during pregnancy and require individual monitoring.

Epilepsy During Pregnancy — seizure changes, medicine levels, monitoring, emergency care, fetal assessment, labour and postpartum dose planning.

After birth

The postnatal period combines changing medicine levels, sleep deprivation, recovery from birth and caring for a newborn. Planning before discharge can reduce avoidable seizure and injury risk.

After Birth: Epilepsy, Sleep, Medication Levels and Baby Safety — postpartum dose reduction, sleep protection, baby-care adaptations and seizure planning.
Breastfeeding and Antiseizure Medicines — drug transfer into milk, infant monitoring and medicine-specific evidence.

Menopause

Perimenopause and menopause can change hormone patterns, sleep, bone health and sometimes seizure control. Hormone replacement therapy also has medicine-specific considerations, particularly with lamotrigine.

Menopause and Epilepsy — perimenopause, seizure change, HRT, lamotrigine, bone health and the limits of current evidence.

Related areas

What should be reviewed regularly?

Reproductive-health needs change over time. Discussions about periods, contraception, fertility, pregnancy, breastfeeding and menopause should be revisited as age, relationships, treatment and reproductive plans change.

A useful review asks not only “Are the seizures controlled?” but also whether the current treatment remains appropriate for the person’s stage of life.

Medication monitoring in pregnancy

Therapeutic Drug Monitoring in Pregnancy →

Sources and guidance

NICE NG217 — Information and support, including reproductive health

NICE NG217 — Principles of treatment, safety, monitoring and withdrawal

MHRA — Valproate reproductive risks

MHRA — Topiramate Pregnancy Prevention Programme

ILAE — Management of epilepsy in pregnancy

Medical note: reproductive-health advice depends on the exact antiseizure medicine, dose, seizure type, age, pregnancy plans and other health conditions. Medication-specific advice should come from the epilepsy team, GP, pharmacist, maternity team or contraception specialist as appropriate.

Related researched deep dives

Evidence checked: September 2026.