Most people with epilepsy are fertile and can conceive naturally. Epilepsy does not automatically mean infertility. However, fertility can be influenced by several overlapping factors including reproductive hormones, seizure networks, antiseizure medicines, menstrual disorders, polycystic ovary syndrome, weight change, sexual function and — in men — sperm quality.
When fertility problems occur, they should not be assumed to come from epilepsy alone. The same causes of infertility seen in the wider population still apply and deserve ordinary fertility assessment.
Fertility and epilepsy are connected in more than one way
Reproduction is controlled through the hypothalamic-pituitary-gonadal axis, which links the brain, pituitary gland and reproductive organs.
Epileptic activity in brain networks connected with the hypothalamus can affect reproductive hormone signalling in some people. Antiseizure medicines can also alter hormone metabolism or produce metabolic effects that influence reproductive function.
This means fertility can be affected by the epilepsy, its treatment, or an unrelated reproductive condition.
Most women with epilepsy can become pregnant
Many women with epilepsy conceive without fertility treatment.
Some studies have found lower birth rates among women with epilepsy, but birth rate is not the same thing as biological fertility. Decisions about pregnancy, social factors, medication concerns, relationship factors and planned avoidance of pregnancy can all influence the number of pregnancies observed in population studies.
It is therefore inaccurate to say that epilepsy generally causes infertility.
Menstrual irregularity can reduce opportunities for ovulation
If periods are very irregular or absent, ovulation may also be irregular.
Possible causes include polycystic ovary syndrome, weight change, thyroid disease, high prolactin, hypothalamic dysfunction, medication effects and other reproductive endocrine disorders.
See Periods, Menstrual Changes and Epilepsy.
Polycystic ovary syndrome can affect fertility
PCOS is one of the most common causes of ovulatory infertility in the general population.
Women with epilepsy may have an increased frequency of PCOS-type reproductive endocrine disturbance, and valproate has been associated with irregular cycles, hyperandrogenism, weight gain and PCOS features in some women and girls.
PCOS does not mean pregnancy is impossible. Ovulation may be infrequent rather than absent, and effective fertility treatments are available when needed.
Valproate deserves particular attention in women
Valproate can affect reproductive health through more than its well-known pregnancy risks.
In some women it has been associated with weight gain, menstrual disturbance, increased androgen activity and PCOS-type features. These effects may improve after treatment is changed, although individual responses vary.
Any treatment change must still protect seizure control.
See Valproate and Reproductive Safety.
Enzyme-inducing medicines can alter sex hormones
Antiseizure medicines such as carbamazepine, phenytoin and phenobarbital can increase hepatic enzyme activity and change the metabolism of sex hormones.
They can also increase sex hormone-binding globulin, altering the amount of biologically available hormone.
The clinical effect varies between individuals and does not mean everyone taking an enzyme-inducing medicine will develop infertility.
Sexual function is part of fertility
Reduced libido, erectile dysfunction, vaginal dryness, pain during sex and relationship difficulties can all reduce the chance of conception even when ovulation and sperm production are normal.
Epilepsy itself, antiseizure medicines, depression, anxiety, hormonal changes and fear of seizures during sex can all contribute.
These concerns are legitimate medical issues and can be assessed rather than simply accepted as part of epilepsy.
See Relationships, Sex & Epilepsy.
Male fertility can be affected too
Fertility conversations in epilepsy historically focused mainly on women, but male reproductive effects are increasingly recognised.
Possible issues include reduced testosterone, altered sexual function and changes in sperm count, motility or morphology.
The strength of evidence differs between medicines.
Valproate and male fertility
Current MHRA guidance states that valproate can potentially cause male infertility.
Reported effects include changes in sperm count, sperm movement and sperm morphology. In some patients these may improve after valproate is reduced or stopped.
The effect is not universal, and a man taking valproate should not assume that he is infertile.
Do not stop valproate to improve fertility without specialist advice
A sudden medication change can cause seizure recurrence or status epilepticus.
NICE now recommends referral to an epilepsy specialist team for men taking sodium valproate who are planning a family within the next year so that treatment options and potential fertility risks can be reviewed.
This allows fertility concerns to be considered alongside seizure control rather than in isolation.
Paternal valproate advice is about more than fertility
UK regulators also advise effective contraception for men taking valproate during treatment and for three months after stopping because of a possible increased risk of neurodevelopmental disorders in children conceived while the father was taking valproate.
This is a separate issue from sperm count or sperm quality.
See Valproate and Reproductive Safety for the detailed paternal-risk discussion.
Other antiseizure medicines and male fertility
Research has reported reproductive hormone and semen changes with several older antiseizure medicines, but studies are often small and results are inconsistent.
Epilepsy itself, smoking, alcohol, obesity, fever, diabetes, varicocele, age and other medicines can also affect semen quality.
An abnormal semen analysis should therefore be investigated in the usual way rather than attributed automatically to antiseizure medication.
When should fertility assessment be considered?
In the UK, couples are generally advised to seek medical advice if pregnancy has not occurred after one year of regular unprotected sex.
Earlier assessment may be appropriate where the woman is older, periods are absent or very irregular, there is known endometriosis or pelvic disease, previous cancer treatment, suspected male-factor infertility or another clear reason fertility may be reduced.
Epilepsy does not remove these ordinary fertility principles.
Fertility assessment should include both partners
Infertility is not solely a women’s-health issue.
Assessment may include confirmation of ovulation, menstrual and medical history, semen analysis, assessment of fallopian-tube or uterine factors and tests guided by the individual history.
Where epilepsy is present, the medication list and seizure-control history should be included from the beginning.
Fertility testing does not require stopping antiseizure treatment
Most investigations can be performed while antiseizure medicines continue.
If medication is suspected of contributing to reproductive problems, treatment changes should be coordinated with the epilepsy team.
Before fertility treatment, review the epilepsy plan
Assisted reproduction can involve hormonal stimulation, procedures, disrupted sleep, stress and rapidly changing reproductive hormone concentrations.
Before treatment begins, the fertility clinic should know the person has epilepsy and the epilepsy team should know what fertility protocol is planned.
This allows potential medicine-hormone interactions and seizure triggers to be addressed in advance.
IVF and other assisted reproductive technologies are possible with epilepsy
Available evidence does not suggest that assisted reproductive technology is generally contraindicated in women with epilepsy.
A 2025 review concluded that ART appears to be a reasonable option when epilepsy is well controlled and treatment is individually managed.
However, the evidence base remains relatively small compared with the general fertility literature.
Hormonal stimulation may affect seizure control in some people
Fertility treatment can produce much higher oestrogen concentrations than occur during an ordinary menstrual cycle.
Because reproductive hormones can influence neuronal excitability, there have been occasional reports of seizure worsening during assisted reproduction.
Most reported women with well-controlled epilepsy remain stable, but seizure monitoring is sensible throughout stimulation cycles.
Lamotrigine deserves special attention during fertility treatment
Oestrogen increases lamotrigine glucuronidation and can lower lamotrigine concentrations.
This interaction is well established with combined hormonal contraception and pregnancy. Hormonal treatment used during assisted reproduction can create a similar clinical concern.
For someone whose seizure control is sensitive to lamotrigine concentration, baseline and treatment-phase drug monitoring may be considered by the epilepsy team.
Enzyme-inducing antiseizure medicines can interact in the opposite direction
Carbamazepine, phenytoin, phenobarbital and other enzyme-inducing antiseizure medicines can increase the breakdown of steroid hormones.
During fertility treatment this may alter exposure to some hormonal medicines used for stimulation or luteal support.
Fertility specialists may need to account for these interactions when designing the treatment protocol.
Do fertility drugs cause epilepsy?
Fertility treatment is not generally considered a cause of epilepsy.
The relevant concern for someone who already has epilepsy is whether rapid hormonal change, sleep disruption or medication interaction temporarily alters seizure susceptibility.
Egg collection and anaesthesia
Egg retrieval is usually a short procedure performed under sedation or anaesthesia.
The anaesthetic team should know the epilepsy diagnosis, seizure type, current medication and rescue plan.
Antiseizure medication should generally continue on schedule unless the treating team gives different instructions.
Fasting needs planning
Procedures may require fasting, but fasting should not inadvertently cause antiseizure medication to be missed.
The fertility and anaesthetic teams can advise when tablets should be taken and whether small amounts of water are permitted.
Sleep around fertility treatment matters
Early appointments, anxiety, hormonal side effects and procedures can disrupt sleep.
For someone with sleep-sensitive epilepsy, protecting sleep around stimulation and egg collection may be an important part of the treatment plan.
What about frozen embryo transfer?
Frozen embryo transfer can be performed using natural-cycle or hormonally prepared protocols.
A recent review has suggested that protocol choice may be relevant for some women with epilepsy because hormone exposure differs.
There is not enough evidence to state that one protocol is universally safer for epilepsy, so treatment should be individualised with the fertility and epilepsy teams.
Pregnancy planning still applies after fertility treatment
IVF does not remove the reproductive risks of antiseizure medicines.
Medication selection, folic acid, valproate or topiramate restrictions and pregnancy drug-level monitoring still apply once conception occurs.
See Preconception Planning, Folic Acid and Epilepsy and Epilepsy During Pregnancy.
Multiple pregnancy can add complexity
Assisted reproduction can increase the chance of multiple pregnancy depending on the treatment method and number of embryos transferred.
Multiple pregnancy carries additional obstetric risks independently of epilepsy.
Modern fertility practice increasingly aims to reduce avoidable multiple pregnancy through embryo-transfer strategies.
Fertility preservation
Some people with epilepsy may consider egg, sperm or embryo freezing for reasons unrelated to epilepsy, such as cancer treatment, delayed parenthood or gender-affirming care.
Epilepsy itself is not usually a barrier to fertility preservation, but medication interactions, anaesthesia and reproductive-risk counselling may need coordination.
Genetic epilepsy does not automatically mean fertility treatment is needed
A genetic cause of epilepsy and a fertility problem are separate questions.
Some genetic epilepsies carry a recurrence risk for children, but that does not necessarily affect the ability to conceive.
Where a pathogenic genetic variant is known, genetic counselling can explain inheritance, uncertainty and reproductive options.
Preimplantation genetic testing is relevant only in selected situations
PGT may be considered when there is a known genetic condition for which testing is technically and ethically appropriate.
It is not a routine test for everyone with epilepsy.
Many epilepsies are genetically complex and cannot be reduced to a single embryo test.
Fertility supplements need the same caution as other supplements
Products marketed to “boost fertility” can contain herbal or pharmacologically active ingredients.
Some may interact with antiseizure medicines or alter seizure threshold.
Supplements should therefore be checked with a pharmacist or clinician rather than assumed to be safe because they are sold without prescription.
Stress during fertility treatment
Fertility treatment can be emotionally demanding.
Stress is not a universal direct cause of seizures, but anxiety can disrupt sleep, eating, medication routines and overall wellbeing.
Psychological support can therefore be useful even when seizure frequency itself does not change.
If fertility treatment fails
Repeated unsuccessful cycles can have significant emotional effects.
Depression, anxiety and relationship strain deserve attention, particularly because mental-health conditions are already more common among people with epilepsy.
Treatment failure should not prompt unsupervised changes to antiseizure medication in an attempt to improve fertility.
Questions worth asking before trying to conceive
- Could my epilepsy or medication be affecting ovulation or sperm quality?
- Does my menstrual pattern suggest that ovulation may be irregular?
- Could valproate be affecting my fertility?
- Should my antiseizure treatment be reviewed before we try to conceive?
- If I am male and take valproate, when should I see the epilepsy team?
- Do I need fertility testing now or should we continue trying naturally?
- If we need IVF, could the hormonal treatment affect my antiseizure medicine levels?
- Should lamotrigine levels be checked during fertility treatment?
- How will medication be managed around egg collection or another procedure?
- Do we need genetic counselling?
The central message
Epilepsy does not automatically mean infertility. Most people with epilepsy remain capable of conceiving, but reproductive function can be influenced by epilepsy, endocrine conditions, sexual function and antiseizure medicines.
Valproate is particularly important because it can affect fertility in both women and men as well as carrying major reproductive-safety restrictions.
When assisted reproduction is needed, IVF and other fertility treatments are generally possible. The main epilepsy-specific issues are maintaining seizure control, checking for medicine-hormone interactions, protecting sleep and planning medication monitoring where appropriate.
Fertility care works best when the fertility team and epilepsy team communicate rather than treating reproductive treatment and seizure management as separate problems.
Related pages: Periods, Menstrual Changes and Epilepsy · Valproate and Reproductive Safety · Preconception Planning, Folic Acid and Epilepsy · Epilepsy During Pregnancy · Relationships, Sex & Epilepsy · Antiseizure Medicines and Contraception
Sources and further reading
NICE NG217 — Information and support: reproductive health and fertility
NICE NG217 — Support and monitoring, including men taking valproate who are planning a family
MHRA — Valproate reproductive risks
The intersection of epilepsy and assisted reproduction: a review of therapeutic approaches and considerations. Seizure. 2025.
NICE CG156 — Fertility problems: assessment and treatment
Evidence checked: September 2026.