Can You Take Antidepressants While Breastfeeding? What the Research Shows
You want to take care of your mental health. You also want to nurse your baby. Somewhere in the haze of new parenthood, those two goals can start to feel like they are pulling against each other, and you are left wondering whether you have to choose.
Here is the reassuring part. For most people, you do not. The research on antidepressants and breastfeeding is deeper and more encouraging than the worry suggests, and one medication in particular has been studied extensively in nursing parents.
Let's walk through what we actually know, calmly and clearly.
Start with both sides of the scale
When people ask whether they can take an antidepressant while breastfeeding, they are usually weighing one thing: the medication. But a good decision weighs two.
There is the question of what passes into breast milk. And there is the question of what happens when postpartum depression or anxiety goes untreated. Both belong on the scale.
Untreated postpartum mood conditions are not a neutral backdrop to early parenthood. They can affect bonding, feeding, sleep, and a parent's ability to function during one of the most demanding seasons of life. For many people, staying well is precisely what makes nursing and caregiving sustainable. So the goal is not to avoid all risk, because there is no zero-risk option here. The goal is the healthiest path for you and your baby, together.
How much actually reaches your baby?
This is the heart of the question, and the news is good.
If you took an antidepressant during pregnancy, your baby was exposed through the placenta, which delivers a far larger share than breast milk ever will. Exposure through milk is substantially smaller. So continuing a medication that helped you through pregnancy usually adds very little for a nursing infant.
Researchers measure this with something called the relative infant dose, which estimates how much of the parent's dose, adjusted for weight, a baby receives through milk. As a general benchmark, a relative infant dose under ten percent is considered compatible with breastfeeding. Most antidepressants studied in lactation fall well under that line, and several come in dramatically lower.
In other words, a small amount does pass into milk. But for the best-studied medications, that amount is low enough that it usually does not produce measurable levels in the baby's blood.
Which antidepressants are best studied?
Not every medication has the same depth of evidence, and that matters.
Sertraline has the strongest track record in breastfeeding and is frequently a first choice for this reason. In a detailed pharmacokinetic study, the amount of sertraline reaching nursing infants came to roughly half a percent of the parent's daily dose, and no adverse effects were observed in the infants (Stowe et al., 2003). Many studies have found sertraline at undetectable levels in nursing babies' blood.
Paroxetine also tends to produce very low or undetectable infant levels.
A large pooled analysis that combined data across many studies found that sertraline, paroxetine, and nortriptyline generally produced undetectable drug levels in nursing infants, while fluoxetine and citalopram were more likely to show up at measurable levels (Weissman et al., 2004). That does not make fluoxetine or citalopram off-limits. It simply means the conversation around them is a little more individualized, often because they and their byproducts linger longer in the body.
The practical takeaway: there are well-studied, reassuring options, and sertraline is often at the top of the list.
What about the baby?
Across the research, serious effects in breastfed infants are uncommon, and most studies report no adverse effects at all.
Because every baby is different, it is still worth knowing what to keep a gentle eye on, especially in a newborn or premature infant whose body clears medication more slowly. Things like unusual sleepiness, fussiness, feeding changes, or not gaining weight as expected are always worth mentioning to your pediatrician, whether or not you take any medication. Most of the time these have nothing to do with an antidepressant, but a quick check-in brings peace of mind.
One myth worth retiring: you do not need to "pump and dump" to clear medication from your milk. Timing feeds around doses does not meaningfully lower exposure for these medications, and discarding milk just adds stress and lost nourishment without a real benefit.
Already on something that works?
If you found a medication that steadied you during pregnancy or earlier, you may not need to change a thing.
Switching to a "more studied" option is not automatically the safer move. A medication that is keeping you well has real value, and trading it for an unfamiliar one risks a return of symptoms at the worst possible time. Sometimes staying the course is exactly right. Sometimes a small adjustment makes sense. This is a decision to make with a psychiatrist who understands the postpartum period, not a rule to apply blindly.
This kind of individualized, evidence-informed conversation is the core of what perinatal mental health care, and reproductive psychiatry more broadly, is built to do.
You can care for yourself and your baby at the same time
The choice between your wellbeing and nursing is, for most people, a false one. Caring for your own mental health is part of caring for your child. They are on the same side of the scale.
At our practice in Austin, we specialize in perinatal mental health and support people through pregnancy, postpartum, and beyond. Whether you are managing depression or anxiety in the early weeks, or planning ahead before your baby arrives, there is a thoughtful path that honors both you and your feeding goals.
Ready to take the next step? Estela Mental Health is located in Austin and accepts several major insurance plans including Aetna, Blue Cross Blue Shield, Cigna/Evernorth, Optum, and United Healthcare. Book an appointment today and let's figure this out together.
Related: Perinatal Mental Health · Reproductive Psychiatry · Depression · Anxiety
References
Stowe, Z. N., Hostetter, A. L., Owens, M. J., Ritchie, J. C., Sternberg, K., Cohen, L. S., & Nemeroff, C. B. (2003). The pharmacokinetics of sertraline excretion into human breast milk: Determinants of infant serum concentrations. Journal of Clinical Psychiatry, 64(1), 73–80.
Weissman, A. M., Levy, B. T., Hartz, A. J., Bentler, S., Donohue, M., Ellingrod, V. L., & Wisner, K. L. (2004). Pooled analysis of antidepressant levels in lactating mothers, breast milk, and nursing infants. American Journal of Psychiatry, 161(6), 1066–1078.
This post is for educational purposes only and is not a substitute for individualized medical advice. Decisions about medication while breastfeeding should always be made in consultation with your own physician or psychiatrist.
