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Baby’s Risk of Cleft Lip 3 Times Higher If Mom Took Topiramate
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Baby’s Risk of Cleft Lip 3 Times Higher If Mom Took Topiramate

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Highlights:
  • A higher dose of topiramate during first trimester of pregnancy may increase a baby’s risk of cleft lip or cleft palate.
  • Pregnant women who took topiramate had three times greater risk of having a baby with cleft lip or palate.
  • Women with epilepsy on topiramate had eight times greater risk of giving birth to a baby with cleft lip or cleft palate.

Women who take high doses of topiramate during the first three months of pregnancy have a higher risk of giving birth to a baby with a cleft lip or palate, suggests new study published in Neurology, the medical journal of the American Academy of Neurology. Topiramate is not a drug that is prescribed during pregnancy; it is used to treat migraines, epilepsy and mood disorders. However, the drug is commonly used and in case of unplanned pregnancies, this becomes a problem.

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"While Topiramate is not recommended for pregnant women, unplanned pregnancies are common, so it's important to fully examine any possible risk," said Sonia Hernandez-Diaz, MD, DrPH, of the Harvard T.H. Chan School of Public Health in Boston. "Our study found that when pregnant women took topiramate during the First Trimester baby's risk of cleft lip or palate was three times greater than if mom was not taking the drug. The risk was higher when the mother took high doses of the drug than when she took lower doses."

Study Overview

The study, using Medicaid data, identified about 1.4 million women who gave birth over a 10-year period. Among them, women who filled a prescription for topiramate during their first trimester were compared with women who did not fill a prescription for any anti-seizure drug. Women who filled a prescription for topiramate were also compared to women who filled a prescription for lamotrigine, another anti-seizure drug.

Total number of pregnancies in each group:
  • Pregnancies in the topiramate group: 2,425
  • Pregnancies in the lamotrigine group: 2,796
  • Pregnancies in the group not taking anti-seizure drugs: 1.3 million
The research team identified how many women from each of these groups gave birth to babies diagnosed with cleft lip or cleft palate.

Study findings

Number of babies born with cleft lip or palate in each group:
  • The group that did not take anti-seizure drugs: 1,501 babies or a risk of 1.1 per 1,000 babies.
  • The group that took topiramate: 4.1 per 1,000 babies
  • The group that took lamotrigine: 1.5 per 1,000 babies
Moreover, women with epilepsy on topiramate had an eight times greater risk of giving birth to a baby with cleft lip or cleft palate compared to women who did not take any anti-seizure drugs. Women who took topiramate for conditions other than epilepsy had a 50% higher risk.
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Women with epilepsy required a higher dose of the drug than women who took the same drug for other conditions. While the average daily dose for women with epilepsy was 200 milligrams, the average dosage for women without epilepsy was 100 milligrams. This further suggests that higher doses of the drug were a major factor for the increased risk of giving birth to babies with cleft lip or palate.

"Our results suggest that women with epilepsy on topiramate have the highest relative risk of giving birth to a baby with cleft lip or cleft palate, likely due to the higher doses of topiramate when used for controlling seizures," said Hernandez-Diaz. "The best course may be to avoid prescribing high doses of topiramate to women of childbearing age unless the benefits clearly outweigh the risks."


Source: Medindia

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