Doctors are continuing to learn more about the best ways to treat epilepsy during pregnancy. By enrolling with the UK Epilepsy and Pregnancy Register if you are pregnant and have epilepsy, you will help to give doctors a clearer picture of which medicines are safest for babies' health.
Most pregnant women with epilepsy have a normal pregnancy and childbirth.
The frequency of seizures may increase in pregnancy in some women with epilepsy. For women with epilepsy, the risk of complications during pregnancy and labour is slightly higher than for women without epilepsy. The small increase in risk is due to:
- The small risk of harm coming to a baby if you have a serious seizure whilst pregnant.
- The possible small risk of harm to an unborn baby from some anti-epilepsy medicines (discussed further below).
Note: the risk of complications to your unborn baby is greater with a seizure compared with the risk of not taking your epilepsy medication.
Risk from anti-epilepsy medicines
If you take anti-epilepsy medicines when you are pregnant, you have a very small increased risk of having a baby with a birth defect. However, this may depend on exactly which medicine you take.
The most recent studies suggest that taking one of the following anti-epilepsy medicines whilst pregnant was not associated with an increased risk of having a baby with a major birth defect.
However the research notes that there is less evidence around about these medicines, as many are newer treatments and they haven't been around such a long time. The same studies show that the following anti-epilepsy medicines are associated with a small increased risk of having a baby with a birth defect:
These medicines are linked with a small increased risk of having a baby with a neural tube defect (such as spina bifida), facial defects such as cleft lip and/or palate, congenital heart defects, arm or leg abnormalities, and a defect of the penis, known as hypospadias.
Fetal anticonvulsant syndrome
Babies whose mothers took valproate for epilepsy during pregnancy may have one or more abnormal features. Some abnormal features may also be seen in babies of mothers who took carbamazepine for epilepsy during pregnancy. Associated features may include abnormalities of the forehead, eyebrows, nose, ears, mouth, fingers, feet and nails. However, the features are often very mild and may also occur in babies whose mothers did not take any medicines for epilepsy during pregnancy.
Before becoming pregnant
Before becoming pregnant, it is best to seek advice from your doctor or epilepsy nurse. You should be seen by an epilepsy expert to discuss in detail your treatment during your pregnancy. The potential risks and benefits of adjusting your treatment, if necessary, can be discussed. If your pregnancy is planned carefully then any risk of complications may be minimised.
Most of the advice is the same as for any other woman who is planning a pregnancy. See separate leaflet called Planning to Become Pregnant.
However, other things that may be discussed include:
- In some cases it may be wise to change to a different medication which is less likely to cause harm to a developing baby (depending on the medication you are already taking).
- It may be an option to stop or reduce the dose of your treatment before you become pregnant if your seizures have been well controlled. However, deciding to come off anti-epilepsy medication can be a difficult decision. Factors such as the type of epilepsy that you have can be important. For example, if you have the type of epilepsy that causes severe tonic-clonic seizures, there is a risk that you could have a severe seizure when you are pregnant if you stop your medication.
- Advice to take folic acid at a strength of 5 mg a day. This should ideally be taken before you become pregnant and be continued until you are 12 weeks pregnant. Although folic acid is recommended for all women who are pregnant, the dose for women taking anti-epilepsy medicines is higher than usual. Taking folic acid has been shown to reduce the risk of having a baby born with a spinal cord problem such as spina bifida.
- Advice to notify your pregnancy to the UK Epilepsy and Pregnancy Register (see link in references below). This is to allow information to be gathered to improve the future management of pregnant women with epilepsy.
Breast-feeding for most women taking anti-epilepsy medicines is generally safe. Your doctor, midwife or health visitor can advise you in more detail.
What are the risks that your child will also have epilepsy?
In general, the probability is low that a child born to a parent with epilepsy will also have epilepsy. However, it can partly depend on your family history, as some types of epilepsy run in families.
Therefore, genetic counselling may be an option to consider if you have, or your partner has, epilepsy and also a family history of epilepsy.
Did you find this information useful?
- Epilepsies: diagnosis and management; NICE Clinical Guideline (January 2012)
- Diagnosis and management of epilepsy in adults; Scottish Intercollegiate Guidelines Network - SIGN (2015)
- British National Formulary; NICE Evidence Services (UK access only)
- Drug interactions with hormonal contraception; Faculty of Sexual and Reproductive Healthcare (January 2017)
- Weston J, Bromley R, Jackson CF, et al; Monotherapy treatment of epilepsy in pregnancy: congenital malformation outcomes in the child. Cochrane Database Syst Rev. 2016 Nov 7 11:CD010224.
- Epilepsy; NICE CKS, June 2015 (UK access only)
- Molgaard-Nielsen D, Hviid A; Newer-generation antiepileptic drugs and the risk of major birth defects. JAMA. 2011 May 18 305(19):1996-2002.
- Bromley R, Weston J, Adab N, et al; Treatment for epilepsy in pregnancy: neurodevelopmental outcomes in the child. Cochrane Database Syst Rev. 2014 Oct 30 10:CD010236. doi: 10.1002/14651858.CD010236.pub2.
- No authors listed; Intrauterine devices: an effective alternative to oral hormonal contraception. Prescrire Int. 2009 Jun 18(101):125-30.
- UK Epilepsy and Pregnancy Register
- UKMEC Summary table for intrauterine and hormonal contraception; Faculty of Sexual and Reproductive Healthcare, 2016
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