Based on limited data, structural defects have been reported
in neonates exposed to montelukast
in utero; however, a specific pattern and relationship to montelukast has not been established. Healthcare providers should report any prenatal exposures to the montelukast pregnancy registry at (800) 986-8999.
Pregnancy Considerations
Maternal use of cetirizine (Zyrtec) has not been associated with an increased risk of major malformations.