What is LactMed?
LactMed is the US National Library of Medicine’s database on drugs and other substances during breastfeeding. Entries discuss available evidence, including levels in milk and possible effects on infants. It is free to use online.
Is there a LactMed app?
Yes. LactRx provides access to LactMed content, which the National Library of Medicine says is updated monthly. LactMed is an established source; you do not need Lacty to access it.
Where does Lacty fit?
Lacty is an app in preparation for searching or scanning products and exploring their ingredients. Its public information draws on sources including LactMed; it also covers food, skincare and supplements. Availability varies by product and country.
Read the details, not just the name.
Check the active ingredients on your own package, especially for combination cold and flu products. Read the source and the details behind any result: names and formulations can vary, and your baby’s age and health can matter.
How to search LactMed.
Look for the active ingredient on the package or in the Drug Facts label. LactMed can be searched by drug or chemical name; its entries bring together published information and references. For a product with more than one active ingredient, look up each one and ask your care team how the complete product applies to you.
How to read a medication entry.
Start with the summary, then look for information about milk levels, reported effects in infants and any notes on milk supply. Not every entry has the same amount of evidence. Follow the cited sources when you need more context, and check when the entry was last updated.
What if I cannot find my product?
Try its ingredient name as well as its brand name. Names and formulations can differ between countries and even within the same product family. A missing result does not establish compatibility. Bring the package or a photo of its ingredients to your doctor, midwife or pharmacist.
Explore ingredients.
This guide is educational and does not replace a healthcare professional. Do not start, change or stop a treatment based on this page alone.
Sources and further reading
Sources checked November 1, 2026.