Researchers at Massachusetts General Hospital and Brigham and Women's Hospital found that women who had a history of epilepsy but had stopped taking anti-seizure drugs were no more likely than any others to have children with birth defects. But they found women who were using drugs to prevent seizures had a higher percentage of babies with major birth defects. Doctors have long known that the drugs can cause birth defects. The question has been whether the genetic defects that cause epilepsy itself can also cause birth defects. It's still hotly debated.
Some doctors deny that the study proved what the authors said it did.
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