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FDA Warns of Risk of Oral Birth Defects in Children Born to Mothers Taking Topiramate

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Washington, DCData from the North American Antiepileptic Drug (AED) Pregnancy Registry indicate an increased risk of oral clefts in infants exposed to Topamax (topiramate) during the first trimester of pregnancy. Infants exposed to topiramate as a single therapy experienced a 1.4 percent prevalence of oral clefts, compared with a prevalence of 0.38 percent – 0.55 percent in infants exposed to other antiepileptic drugs.

Infants of mothers who did not have epilepsy and were not being treated with other antiepileptic drugs had a prevalence of 0.07 percent. Similar data from the United Kingdom Epilepsy and Pregnancy Register supported the North American AED Pregnancy Registry data.

Based on the data, topiramate will have a stronger warning in its prescribing information (labeling). The pregnancy category will be changed to Pregnancy Category D. This means that there is positive evidence of human fetal risk based on human data, but the potential benefits of the drug in pregnant women may outweigh the risks in certain situations. The FDA previously designated the drug as Pregnancy Category C because of the lack of human data. More information about the Pregnancy Categories can be found in the FDA’s Drug Safety Communication1.

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