Asthma Medication Use and Risk of Birth Defects: National Birth Defects Prevention Study, 1997-2011

Consistent with previous NBDPS analyses, asthma medication use was not associated with most birth defects examined, but we observed modest risks for bronchodilator use and several birth defects. Our findings support maintaining adequate asthma treatment during pregnancy, as early pregnancy asthma exacerbations have been associated with adverse birth outcomes, including birth defects.