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Bendectin and human congenital malformations.

P H Shiono1, M A Klebanoff

  • 1National Institute of Child Health and Human Development, Prevention Research Program, Bethesda, Maryland 20892.

Teratology
|August 1, 1989
PubMed
Summary
This summary is machine-generated.

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This study found no increased risk of major birth defects from Bendectin exposure during early pregnancy. The observed associations with specific malformations were likely due to chance or other factors like maternal vomiting.

Area of Science:

  • Obstetrics and Gynecology
  • Teratology
  • Epidemiology

Background:

  • Bendectin (doxylamine succinate and pyridoxine hydrochloride) was widely prescribed for nausea and vomiting during pregnancy.
  • Concerns existed regarding a potential link between Bendectin use and congenital malformations.

Purpose of the Study:

  • To prospectively investigate the relationship between first-trimester Bendectin exposure and the occurrence of congenital malformations.
  • To determine if observed associations were statistically significant or attributable to confounding factors.

Main Methods:

  • A prospective cohort study of 31,564 newborns in the Northern California Kaiser Permanente Birth Defects Study.
  • Statistical analysis using odds ratios and confidence intervals to assess malformation risks.

Related Experiment Videos

  • Comparison with an independent study (Collaborative Perinatal Project) to evaluate confounding by maternal vomiting.

    • Main Results:

    • No overall increase in major malformations was associated with Bendectin use (odds ratio = 1.0).
    • Three specific malformations (microcephaly, congenital cataract, lung malformations) showed a statistical association with Bendectin.
    • These three associations were consistent with chance findings and two were strongly associated with maternal vomiting independent of Bendectin use.

    Conclusions:

    • Bendectin exposure during the first trimester does not increase the overall rate of major congenital malformations.
    • The observed associations with specific malformations are unlikely to be causally related to Bendectin.
    • Maternal vomiting during pregnancy may be a confounding factor for certain birth defects.