If you are a woman living with epilepsy, there is an important conversation that does not happen often enough, between you and your doctor, between women in the same community, or even in women's health spaces.
Some anti-seizure medications significantly reduce the effectiveness of hormonal contraception. This includes the pill, the patch, the implant, and the hormonal injection. The interaction is real, well-documented, and still widely unknown among patients and, in some settings, among healthcare providers.
Why this happens
Certain anti-seizure medications (particularly older ones) are what pharmacologists call enzyme inducers. They cause the liver to break down other drugs more quickly than usual, including the hormones in contraceptives. When that happens, the contraceptive does not work as intended.
The medications most commonly associated with this interaction include:
- Carbamazepine (Tegretol)
- Phenytoin (Dilantin)
- Phenobarbital
- Primidone
- Oxcarbazepine (at higher doses)
- Topiramate (at higher doses)
Newer medications such as lamotrigine, levetiracetam, and valproate are generally considered non-enzyme-inducing and do not carry the same risk, though valproate has its own significant concerns for women of childbearing age (discussed below).
What this means practically
If you are taking an enzyme-inducing anti-seizure medication and relying on hormonal contraception alone, your risk of unintended pregnancy is higher than you may realise.
This does not mean you cannot use hormonal methods, but it may mean you need a higher-dose pill, a different method, or additional contraception. The copper IUD and the hormonal IUD (Mirena) are not affected by enzyme-inducing medications and are considered reliable options for women in this situation. This is a conversation to have with your doctor or pharmacist, but you need to know to have it.
A note on valproate and pregnancy
Sodium valproate (Epilim) is one of the most effective anti-seizure medications available, and it is widely used. However, it carries a significant risk of birth defects and developmental problems if taken during pregnancy. In some countries, it is no longer prescribed to women of childbearing age without a formal acknowledgement of this risk.
If you are taking valproate and are of childbearing age, talk to your doctor about whether it is still the right medication for you, and about contraception. This is not a reason to stop medication without guidance, but it is a reason to have an informed conversation.
Epilepsy, pregnancy, and planning
Having epilepsy does not mean you cannot have children. Many women with epilepsy have safe pregnancies and healthy babies. What matters is planning, ideally before conception, so that your medication can be reviewed, your seizure control is as stable as possible, and you and your healthcare provider are working together.
If you are thinking about pregnancy and you have epilepsy, ask to speak to a neurologist or a doctor with experience in epilepsy and women's health. If that access is difficult, organisations like Kiserem can help connect you with information and support.
You deserve to know
Healthcare in Kenya is stretched. Appointments are short. Not every doctor has time to go through every interaction for every medication. That is why community knowledge matters, so that women can walk into those appointments already knowing what questions to ask.
The key question is simple: Does my epilepsy medication affect my contraception?
You deserve a clear answer. If you are not sure, get in touch with us and we will do our best to point you in the right direction.
This post is for informational purposes. It does not replace medical advice. Always consult a qualified healthcare provider before changing your medication or contraception.