What Is LactMed, and Who Is It For?
LactMed is the Drugs and Lactation Database, a peer-reviewed reference maintained within the National Institutes of Health's National Library of Medicine. It compiles the published evidence on medications and other substances during breastfeeding, and it is one of the standard references clinicians consult when a nursing parent's medication raises a question. This page describes what the database is and how to understand its role; it does not, and cannot, tell anyone whether a particular medication is compatible with nursing — that determination belongs with the prescribing clinician, who has the full picture of both patient and drug.
What the database is
LactMed is a literature-based reference: its entries summarize what published research reports about substances in the context of lactation. It is freely accessible to the public through the National Library of Medicine, and it is peer-reviewed, which distinguishes it from the informal medication lists that circulate online. Its subject matter is broad — the database covers drugs and other substances — but its method is consistent: it reports what the evidence says, with the evidence cited.
Who it is for
The database's primary audience is clinical. Physicians, pharmacists, nurses, and lactation consultants use it when medication questions arise for a breastfeeding patient, typically alongside the rest of the clinical literature — the Academy of Breastfeeding Medicine's clinical protocols, for instance, represent the kind of evidence-based lactation guidance that professionals in this field work from. For a caregiver in training, or an aide working a mother-baby unit, the useful thing to know about LactMed is simply that it exists and that it is where the professionals look: when a parent on the unit asks whether a medication is "okay while nursing," the correct move is never to guess or to search on their behalf, but to bring the question to the nurse or clinician, who has both the reference and the authority to use it.
Why a summary database is not a decision
It is worth being explicit about why reading a database entry is not the same as getting an answer. A clinical decision about medication during lactation weighs things no database entry contains: the patient's condition and why the medication was prescribed, the dose, the alternatives, and the infant's own circumstances. LactMed supplies one input — the published evidence about the substance — and the clinician supplies the judgment. This is the general shape of clinical references everywhere: they inform professionals; they do not substitute for them. A layperson can read LactMed, and there is no harm in knowing the resource exists, but the reading should end in a conversation with the prescriber, not in a decision.
Where it fits in this site's subject
For readers of this site, LactMed matters as part of the reference landscape around maternal-infant care work, alongside the international and federal resources described in where breastfeeding education fits in caregiver training. Knowing the landscape — which questions have institutional answers, and which institution holds them — is part of what separates a trained caregiver from a well-meaning one. The aide's version of medication competence is not pharmacology; it is knowing that the question is clinical, and moving it swiftly to the person qualified to answer it.