If you’ve been prescribed antibiotics while breastfeeding, it’s natural to wonder whether the medication will pass into your breast milk, and whether it’s safe for your baby. The reassuring, well-supported answer is that most antibiotics are compatible with breastfeeding – but not all of them equally, and it’s worth understanding the details rather than just hoping for the best. Here’s what to know.
Antibiotics are medications that aid in the treatment of bacterial infections. They do this by either killing the bacteria or preventing them from replicating or reproducing.
Because they do not kill viruses, they should be used only if you have a confirmed bacterial infection.
When you’re sick, it’s best to let your body fight the infection on its own so that your immunity can build. This, however, is not always possible. If your infection isn’t improving, talk to your doctor about antibiotics.
AGenerally, yes. The American Academy of Pediatrics notes that antibiotics are among the most common medications prescribed to breastfeeding mothers, and while all antibiotics pass into breast milk to some degree, most do so at levels considered safe for a healthy, full-term infant. As a general principle, if an antibiotic would be considered safe to give directly to a premature infant or newborn, it’s generally considered safe for a breastfeeding mother to take.
That said, a small number of antibiotics can pose more risk – potentially affecting an infant’s bone growth or tooth development, or worsening jaundice in certain circumstances. This is exactly why it’s important to tell any prescribing doctor that you’re breastfeeding, so they can factor this into their choice of antibiotic.
Based on guidance from LactMed (the NIH’s drug-and-lactation database) and major clinical sources, the following classes are generally considered preferred, first-line options during breastfeeding:
This isn’t an exhaustive list, and it doesn’t replace an individual assessment – your doctor or pharmacist will consider your specific infection, your baby’s age and health, and any other medications involved before prescribing.
A few antibiotic classes are generally used more cautiously during breastfeeding, particularly with newborns, premature infants, or babies with jaundice or G6PD deficiency:
If you’re prescribed one of these, it doesn’t automatically mean you need to stop breastfeeding – your doctor will weigh the benefits of treating your infection against the specific risk factors for your baby, and may suggest an alternative if a suitable one is available.
For the most part, no – this is a common worry, but most antibiotics aren’t associated with a meaningful drop in milk supply. The medications actually linked to reduced milk supply are different: decongestants containing pseudoephedrine or phenylephrine (common in cold and flu remedies), estrogen-containing hormonal contraceptives, and the fertility medication clomiphene. If you’re prescribed an antibiotic and also taking a combination cold medicine, it’s the decongestant component – not the antibiotic – that’s more likely to be the concern, so it’s worth mentioning any other medications you’re taking to your doctor.
Yes, to some degree – almost any medication present in your bloodstream will transfer into breast milk to some extent. For most antibiotics, this happens at low concentrations that pose minimal risk to a healthy infant, which is part of why choosing the right antibiotic (rather than avoiding antibiotics altogether) is usually the better approach when you have a bacterial infection that needs treatment.
Antibiotics work by killing bacteria in your body, both harmful bacteria and “good” bacteria that keep you healthy. As a result, antibiotics can create a number of uncomfortable situations for both of you and your babies.
If you have to take antibiotics while breastfeeding your baby, you may notice that he or she has runny poop. The poop’s color may also change to green. This, however, does not require treatment and resolves itself as soon as you stop taking antibiotics.
When you take antibiotics while nursing, your baby may become a bit more unsettled and exhibit colic-like symptoms. You do not need to stop breastfeeding or cease the antibiotic course.
Antibiotics may alter the density of natural bacterial flora in the small intestine, resulting in diarrhea. Keep in mind, however, that this is usually brief and non-harmful. It’s also important to remember that breastmilk can help heal your baby’s gut and re-establish a healthy balance of gut bacteria, so it’s important to keep breastfeeding.
Thrush can affect both you and your baby. Thrush is a fungal infection caused by the yeast Candida albicans. The treatment for this condition includes antifungal medications for both mom and baby. When taking an antibiotic, you can also take a probiotic to keep your gut bacteria happy and balanced.
Certain precautions can be taken to protect your baby from the side effects of antibiotics while nursing:
When prescribed antibiotics, it’s worth covering:
Keep an eye on your baby for changes in feeding or sleeping patterns, unusual fussiness, or a rash while you’re taking antibiotics. Contact your doctor promptly if you notice:
Never self-medicate, and always consult a doctor before starting any antibiotic while breastfeeding, to make sure the specific medication is appropriate for your situation.
Yes, in most cases – most antibiotics are compatible with breastfeeding, though the specific choice matters, so always tell your prescribing doctor you’re nursing.
Penicillins (like amoxicillin) and cephalosporins are generally considered preferred, first-line options, with macrolides also generally considered safe. Your doctor will choose based on your specific infection and your baby’s health.
Tetracyclines, fluoroquinolones, and sulfonamide antibiotics (like Bactrim) are generally used more cautiously, particularly with newborns, premature infants, or babies with jaundice.
Generally, no – most antibiotics aren’t linked to reduced milk supply. Decongestants like pseudoephedrine, estrogen-containing birth control, and certain fertility medications are more commonly associated with this effect.
Yes, to some degree, as almost all medications in the bloodstream transfer into breast milk – but for most antibiotics, this happens at low levels considered safe for a healthy infant.
Taking antibiotics while breastfeeding is usually straightforward and safe, particularly with commonly used options like penicillins and cephalosporins – but the specific antibiotic, your baby’s age, and their health all factor into what’s genuinely appropriate for your situation. The most important step is simple: always tell your doctor you’re breastfeeding before starting any medication. If you’d like to talk through a prescription you’ve been given, or have concerns about your baby’s reaction to a medication, consult a doctor through the MaNaDr app for guidance tailored to your situation.
