There is no published experience with fluphenazine during breastfeeding. Very limited long-term follow-up data indicate no adverse developmental effects when other phenothiazines are used alone. Because of the lack of published experience with fluphenazine during breastfeeding, other antipsychotic agents may be preferred, especially while nursing a newborn or preterm infant. Monitor the infant for drowsiness and developmental milestones, especially if other antipsychotics are used concurrently.