Despite the increasing use of the newer “atypical” or second-generation antipsychotic agents to treat a spectrum of psychiatric disorders, including schizophrenia, bipolar disorder, major depression, PTSD and other anxiety disorders, we have relatively little data on the use of these newer atypical agents in breastfeeding women.  

All medications taken by the mother are excreted into the breast milk, and the risk of toxicity for breastfed infants varies across different medications.  When advising women regarding the risks associated with the use of any medication while breastfeeding, the discussion must take into consideration the benefits of breastfeeding, while at the same time considering the potential risks associated with exposure to the medication contained in the breast milk, as well as the increased risk of recurrent psychiatric illness if the medication is changed or discontinued.

The data on atypical antipsychotic medications comes from case reports and small case series.  Because we have no randomized controlled studies, it is difficult, if not impossible, to account for other factors which may also affect outcomes, including exposure to other medications or exposure to psychiatric illness in the mother.  Furthermore, some of these data are derived from adverse event reporting, which may lead to over-reporting of adverse events.  

The information in this post is derived from a very thorough review article published in 2016 by Pacchiarotti and colleagues which summarized published data regarding the outcomes of children whose mothers were prescribed atypical antipsychotic medications while breastfeeding.  Other information in this table derives from the Drugs and Lactation Database (LactMed) maintained by the National Library of Medicine.

Olanzapine (Zyprexa)

At this point, we have the most data on olanzapine (Zyprexa) with a total of 40 exposures.  Maternal doses of olanzapine up to 20 mg daily produced low levels in the breast milk and very low or undetectable levels in the serum of breastfed infants.  The amount  

Looking at the data as a whole, it looks as if the risk of adverse events in olanzapine-exposed infants is low, although sedation has been reported.  One of the 40 infants had icterus and sedation; however, these symptoms persisted even after bottle feeding was initiated so it is not clear that these symptoms were caused by exposure to olanzapine.

Long-term follow-up of infants exposed to olanzapine is limited.  



Study Design

Sample and Maternal Dose

Main Outcomes

Olanzapine (OLZ), Zyprexa         


Total of 40 exposures

Gilad et al., 2011

Prospective controlled observational study

22 mothers breastfeeding while taking OLZ, 15 mothers taking OLZ but did not breastfeed and 51 breastfeeding mothers with no OLZ

Data on lactation and outcome at the age of 1–2 years were obtained. The rate of adverse outcomes in OLZ-exposed breastfed infants did not differ from those of the control groups.

Whitworth et al., 2010

Case report

1 mother-infant pair (5-15 mg/day)

Relatively high plasma level in the infant aged four months (Maternal dosage 15 mg, infant’s OLZ concentration 11 ng/ml) probably related to an immature hepatic metabolism.  OLZ plasma levels decreased to very low or even undetectable during the following four months

Lutz et al., 2008

Case report

1 mother-infant pair (5 mg/day)

No adverse effects were noticed in the infant.  Levels in the infant undetectable.

Ambresin et al., 2004

Case report

1 mother-infant pair (20 mg/day)

The relative amount of drug transferred to the infant was about 4% of maternal weight-adjusted dose.

Gardiner et al., 2003

Case series

7 mother-infant pairs (5–20 mg/day)

OLZ was not detected in the plasma of the 6 infants.  No adverse effects were found in the infants.  

Croke et al., 2002

Case series

 5 Mother-infant pairs (2.5–10 mg/day)

No adverse effects were found in the infants.

Goldstein et al., 2000

Case series

2 Mother-infant pairs (5–10 mg/day)

In one infant, the exposure to OLZ at 5 mg was associated with icterus and sedation; although bottle-fed was initiated, icterus and sedation continued. No adverse events in the second infant.

Kirchheiner et al., 2000

Case report

1 Mother-infant pair (10mg/day)

No adverse events reported.

Aripiprazole (ARP), Abilify          


Total of 2 exposures

Watanabe et al., 2011

Case report

1 mother-infant pair (18mg/day)

No adverse events reported

Lutz et al., 2010

Case report

1 mother-infant pair (15mg/day)

Neither ARP nor its metabolite was detected in the infant.  No adverse events reported.

Quetiapine (QTP), Seroquel             


Total of 9 exposures

Rampono et al., 2007

Case report

1 mother-infant pair (400 mg/day)

No adverse effects were noted in the infant

Misri et al., 2006

Case series

 6 mother-infant pairs (25–400 mg/day)

QTP levels in breast-milk ranged from not detected to 32–264 nmol/L depending on QTP doses.  4 out of the 6 babies scored as being within normal limits on the Bayley Scales of Infant Development, whereas 2 showed a mild developmental delay.

Gentile, 2006

Case report

1 mother-infant pair (400 mg/day)

No adverse events reported.

Lee et al., 2004

Case report

1 mother-infant pair (200 mg/day)

No adverse effects reported.

Risperidone (RIS), Risperdal      


Total of 4 exposures

Aichhorn et al., 2005

Case report

1 mother-infant pair (2–3 mg/day)

No adverse effects reported.

Ilett et al., 2004

Case series

3 mothers and 2 infants (1.5–4 mg/day)

No adverse effects reported.

Hill et al., 2000

Case report

1 mother (6mg/day)

No adverse effects reported.

So what would we typically recommend in a woman who is taking one of these medications (other than olanzapine) and would like to breastfeed?  There is no easy answer here.  With sparse information to guide these decisions, the choices a patient makes may be driven more by personal factors — for example, her commitment to breastfeeding or the severity of her illness.  As clinicians, we must provide the little information we do have to patients while at the same time emphasizing the extreme vulnerability to recurrent illness women with bipolar disorder face during the postpartum period.  

This is also an opportunity to support the decision to forgo breastfeeding.  Most women feel considerable pressure to breastfeed, but for many women with bipolar disorder, not breastfeeding might be the best option.  This allows the woman to maximize her pharmacologic treatment without worrying about exposing the nursing infant to medications.  Bottle feeding also makes it easier to for others to participate in caring for the newborn and may also help to minimize sleep deprivation, which can be a potent trigger for women with bipolar illness.  Of greatest importance here is doing everything we can do to keep the mother healthy.  While breastfeeding is beneficial for the mother and the newborn, all of these benefits are erased if the mother becomes ill during this vulnerable time.


Ruta Nonacs, MD PhD  


Pacchiarotti I, León-Caballero J, Murru A, Verdolini N, et al. Mood stabilizers and antipsychotics during breastfeeding: Focus on bipolar disorder.  Eur Neuropsychopharmacol: 2016 Oct; 26(10):1562-78. Epub 2016 Aug 24. Review.

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