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Teratogen update: pseudoephedrine.

Martha M Werler1

  • 1Slone Epidemiology Center, Boston University, Boston, Massachusetts 02115, USA. mwerler@slone.bu.edu

Birth Defects Research. Part A, Clinical and Molecular Teratology
|August 26, 2006
PubMed
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Pseudoephedrine, a common decongestant, may slightly increase the risk of certain birth defects like gastroschisis when used in early pregnancy. Further research is needed to confirm these findings and explore intranasal formulations.

Area of Science:

  • Pharmacology
  • Teratology
  • Obstetrics

Background:

  • Pseudoephedrine is a widely used alpha-adrenergic agonist in nasal decongestants.
  • It is frequently used during pregnancy, with an estimated 25% of women exposed.
  • Alpha-adrenergic agonists can constrict blood vessels, potentially affecting uterine blood flow.

Purpose of the Study:

  • To investigate the association between first-trimester pseudoephedrine use and specific birth defects.
  • To explore the hypothesis that vasoconstrictive effects of pseudoephedrine may increase the risk of vascular disruption defects.

Main Methods:

  • Analysis of health maintenance organization pharmacy data.
  • Case-control studies examining first-trimester decongestant exposure.
  • Comparison of risks between pseudoephedrine users and non-users, considering factors like smoking.

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Main Results:

  • Initial analyses suggested no overall association with birth defects.
  • A recent study linked decongestant use to an increased risk of ventricular septal defects.
  • Case-control studies found small increases in risks for gastroschisis, small intestinal atresia, and hemifacial microsomia.

Conclusions:

  • First-trimester pseudoephedrine use may be associated with a slight increase in the risk of specific vascular disruption defects.
  • Concomitant cigarette smoking may exacerbate these risks.
  • Limitations include potential recall bias, confounding by indication, and the need to investigate intranasal formulations.