<p><strong>Pregnancy</strong>: Inhaled budesonide has been assigned to pregnancy category B by the FDA. Budesonide has not been shown to be teratogenic in animals when given in high doses by inhalation. Despite the animal findings, it would appear that the possibility of fetal harm is remote if the inhaled drug is used during pregnancy. Nevertheless, because the studies in humans cannot rule out the possibility of harm, inhaled budesonide should be used during pregnancy only if clearly needed.<br />
<br />
<strong>Lactation</strong>: The amounts of inhaled budesonide excreted into breastmilk are minute and infant exposure is negligible. Reviewers and an expert panel consider inhaled corticosteroids acceptable to use during breastfeeding. When taken by mouth, budesonide is only about 9% bioavailable; bioavailability in the infant is likely to be similarly low for any budesonide that enters the breastmilk.</p>