Benzodiazepine Use Linked to Low Birth Defect Risk
A large study suggests filling a benzodiazepine prescription in early pregnancy does not increase risk of major malformations.
Updated on Oct. 12, 2026 in Pregnancy
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Researchers found no significant link between first-trimester benzodiazepine exposure and major congenital malformations in live births. The findings rely on an analysis of over 4 million pregnancies across public and commercial insurance databases in the United States.
Why it matters
This research provides clinical reassurance for pregnant individuals who may require treatment for anxiety or other conditions. Understanding the safety profile of these medications is critical for patients and physicians weighing the benefits and risks of treatment during pregnancy.
In a population-based cohort study of over 4 million U.S. pregnancies, researchers found an adjusted relative risk of 0.99 for major congenital malformations among those with first-trimester benzodiazepine exposure. The analysis focused specifically on live births.
The players
Brigham and Women's Hospital
A Boston-based teaching hospital affiliated with Harvard Medical School that conducts extensive clinical research on maternal and fetal health outcomes.
Stanford University
A California-based research institution that frequently contributes to major studies regarding reproductive health and pharmaceutical safety.
The details
Researchers utilized propensity score fine stratification to compare outcomes between groups, identifying malformations through medical and procedure codes within 90 days after delivery. While the pooled analysis showed no substantial link, data indicated that combining benzodiazepines with antiepileptic drugs or mood stabilizers carried a higher risk for gastrointestinal or central nervous system malformations. The study specifically tracked live births documented in Medicaid and Merative MarketScan databases.
Timeline
2000-2018: Period of data collection for the Medicaid database.
2003-2020: Period of data collection for the Merative MarketScan database.
October 12, 2026: Study findings were published in the Annals of Internal Medicine.
Health Landscape
This study contributes to the growing body of literature focused on the safety of common psychiatric medications during pregnancy, as published in the Annals of Internal Medicine. It offers a large-scale update to previous research that often lacked the granularity provided by modern propensity-score analysis.
If you are pregnant or planning to become pregnant, discuss the risks and benefits of all medications with your obstetrician or primary care provider. This is especially important if you are using multiple types of medications, such as combining anxiety treatments with mood stabilizers.
The takeaway
The study suggests that benzodiazepine use alone in early pregnancy does not pose a significantly increased risk for major birth defects in live births. Patients should always consult their physician before starting or changing any medication regimen during pregnancy.
Further reading
For more information on managing health during the prenatal period, see our Pregnancy section.
Source note: This article includes information reported by Medscape.
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