Pauline Anderson

December 11, 2024

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 The majority of women with epilepsy are inadequately educated about the potential risks associated with anti-seizure medications (ASMs), which include teratogenicity and a reduction in the efficacy of hormonal birth control, early results of a new survey suggested.

In addition, only about a third of survey respondents indicated that they were taking folic acid if pregnant or planning to be or using an effective contraceptive if they wanted to avoid pregnancy.

“Physicians should see it as inside their scope to ask about the family planning aspect of things because it’s relevant to their patients’ neurologic care,” first study author Tori Valachovic, a fourth-year medical student at the University of Rochester School of Medicine, New York, told Medscape Medical News.

Tori Valachovic

She noted patients may be taking ASMs not just for seizures but potentially to manage migraines or a mood disorder.

The findings were presented on December 8 at the American Epilepsy Society (AES) 78th Annual Meeting 2024.

Unique Survey

Research shows that about half of pregnancies in the United States are unplanned, and the number is even higher among people with epilepsy, said senior author Sarah Betstadt, MD, associate professor of obstetrics and gynecology, University of Rochester. That may be because women aren’t appropriately counselled about ASMs, possibly reducing the effectiveness of their hormonal birth control, she said.

Sarah Betstadt, MD

The American Academy of Neurology recommends women with seizure disorders who could become pregnant receive yearly counseling about reproductive health, including ASM teratogenicity and interactions with hormonal contraceptive medications.

The study included 107 women aged 18-49 years at two general neurology outpatient clinics who were taking an ASM and completed a survey between July 2023 and May 2024. Of these, six were pregnant or planning to become pregnant, and 69 were using a barrier, hormonal, or implant form of contraception.

Researchers collected medical histories for each respondent, including how long they had had a seizure disorder, how often they experienced seizures, what anti-seizure drugs they were taking, the type of birth control they used, their pregnancy intentions, and whether they were taking folic acid.

The survey was unique in that questions were personalized. Previous surveys have asked general questions, but for the current survey, patients were required to input their specific ASM and specific birth control, so it was also a test of their knowledge of their specific medications, said Valachovic.

When responding to questions about the safety of their ASMs for pregnancy or whether there were interactions between ASMs and birth control, about two thirds (67.3%) of the participants answered at least one question incorrectly.

The study found 36.2% of those using a barrier, hormonal, or implant contraceptive answered at least one question incorrectly regarding whether their ASM decreased birth control effectiveness.

ASMs such as carbamazepine, phenytoin, phenobarbital, higher doses of topiramate (over 200 mg daily), and oxcarbazepine can make hormonal contraceptives such as pills, patches, and rings less effective, noted Valachovic.

There’s also a bidirectional relationship at play, she added. Hormonal contraceptives can make ASMs such as lamotrigine, valproate, zonisamide, and rufinamide less effective because they decrease the levels of the ASMs.

For questions specifically about the teratogenicity of their medications, about 56.1% of participants did not answer correctly.

ASMs that increase the risk for birth defects include valproic acid (a drug that would be at the top of the list), topiramate, carbamazepine, phenobarbital, and phenytoin, said Valachovic.

However, she added, “It’s a little bit more nuanced” than simply saying, “Don’t take this medication during pregnancy” because the first aim is to control seizures. “Uncontrolled seizures are more dangerous for the fetus and the expectant mother than any ASM,” she explained.

Neurologists and reproductive healthcare providers should work together to better disseminate relevant information to their female patients who could become pregnant, said Betstadt. “We need to have better ways to collaborate. And I think we have to start with educating neurologists,” who care for these women throughout their journey with epilepsy and who during that time may become pregnant.

They “should be talking to their patients annually about whether they plan to be pregnant,” so they can educate them and make them aware of dangers to the fetus with certain medications and the effect of ASMs on birth control, added Betstadt, whose practice focuses on complex family planning.

“Our hope is that patients will have better care that’s in line with their reproductive goals,” she said.

No Trickle-Down Effect

Commenting for Medscape Medical News, Alison M. Pack, MD, professor of neurology and Epilepsy Division Chief, Columbia University, New York City, said the study underlines an important quandary: Despite guidelines on risks of combining ASMs and hormonal birth control, this information doesn’t seem to be “trickling down” to women with epilepsy.

“I think part of it is just the state of healthcare delivery these days,” where clinicians are expected to accomplish more and more within a 20-30–minute follow-up visit. It’s tough, too, to keep up with all the potential drug interactions involved with newer ASMs, she said.

“I also think it speaks to the complexity” of healthcare for young women with epilepsy, which involves not just neurologists but obstetricians, gynecologists, and primary care doctors, she added.

Pack doesn’t think epilepsy specialists “integrate” enough with these other specialties. “You need to communicate with the gynecologist; you need to open that line of communication.”

She believes advanced practice providers could play a role in reducing the complexity of treating young women with epilepsy by regularly reviewing how patients are adhering to recommended protocols.

But she pointed out that “in the overall picture, most women with epilepsy do have normal, healthy pregnancies.”

The investigators and Pack reported no relevant conflicts of interest.

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