Drugs and Lactation Database
Little published information is available on the use of duloxetine during breastfeeding; however, the dose in milk is low and serum levels were low in two breastfed infants.
Monitor the infant for drowsiness, adequate weight gain, and developmental milestones, especially in younger, exclusively breastfed infants and when using combinations of psychotropic drugs. Galactorrhea has been reported in women taking duloxetine.
Six lactating women who were at least 12 weeks postpartum and weaning their infants were given duloxetine 40 mg with food every 12 hours for 3.5 days. Milk samples from both breasts were obtained before and at 1, 2, 3, 6, 9 and 12 hours after the dose on day 4. Peak milk duloxetine levels occurred at an average of 6 hours after the dose. The amount of duloxetine excreted into breastmilk was approximately 7.4 mcg (range 3.6 to 15 mcg) daily in these women. The normalized milk excretion corresponded to a daily infant dosage of 0.2 mcg/kg or 0.14% (maximum 0. 0.25%) of the weight-adjusted maternal dosage.