What this stomach medicine is, why some doctors outside the U.S. prescribe it to increase milk, its heart and stopping risks, why the FDA warns against it, and what to try first.
Domperidone is a stomach medicine, used in some countries for nausea and slow stomach emptying. One of its side effects is raising prolactin, the hormone that makes breast milk, so some doctors outside the U.S. prescribe it “off-label” for low milk supply. In the U.S., domperidone isn’t approved by the FDA for any use, and the FDA has warned breastfeeding women not to use it because of serious heart risks. It should never be bought online or imported without a doctor, and if you’re already taking it, don’t stop suddenly; plan any change with your prescriber.
What domperidone is and how it works
Domperidone blocks dopamine, a brain chemical that normally holds prolactin down. With less dopamine signal, prolactin rises, and milk production can increase. It’s sold under brand names such as Motilium in many countries, where it’s prescribed mainly for stomach problems.
Does domperidone increase breast milk?
Some small studies found that domperidone increased milk volume, mostly in mothers pumping for premature babies in hospital. Results vary, and it only helps when low prolactin is part of the problem. It doesn’t fix low supply caused by infrequent feeding, a poor latch, a pump problem or less glandular breast tissue. Lactation experts agree it should only be considered after those causes have been checked and addressed.
Why the FDA warns against it
- Not approved: domperidone isn’t an FDA-approved drug for any use in humans.
- Heart risks: the FDA has identified serious heart problems, including dangerous heart rhythms, in women using it to increase milk, and issued warnings in 2004 and 2012.
- Stopping risks: in 2023, the FDA reported psychiatric symptoms such as anxiety, depression and insomnia in women stopping or tapering domperidone after using it for lactation.
- Legal status: distributing domperidone products in the U.S. is generally illegal, with limited exceptions under special research programs.
Domperidone side effects
Common: dry mouth, headache, stomach cramps, diarrhea and weight gain.
Serious: an abnormal heart rhythm, which can cause palpitations, dizziness, fainting or, rarely, sudden cardiac death. The risk is higher with higher doses, older age, existing heart problems, low potassium or magnesium, and some other medicines that affect heart rhythm, including certain antibiotics, antifungals and antidepressants.
When stopping: anxiety, low mood, trouble sleeping or agitation, especially after stopping quickly.
Small amounts pass into breast milk; no common harms in babies have been reported, but the main concern is the mother’s heart.
Seek urgent care if you take domperidone and have a racing or irregular heartbeat, chest pain, dizziness or fainting. Call your prescriber about new anxiety, low mood or sleep problems, especially while reducing it.
If you’re considering domperidone
- Don’t buy it online or from overseas without a prescriber. Quality, dose and safety can’t be checked.
- Ask a doctor and lactation consultant to look for the cause of low supply first.
- If you live where it’s prescribed, your doctor should review your heart health, heart-related family history and all your medicines, and may check a heart tracing (ECG) first.
- If you’re already taking it, don’t stop abruptly. Plan any reduction with your prescriber.
In the U.S., some doctors prescribe metoclopramide, another stomach medicine, for low supply. It has its own serious risks, including depression and movement problems, and is usually used only for a short time. Ask your doctor about the pros and cons.
What to try first
Most low supply improves with more frequent and effective milk removal: feeding or pumping 8 to 12 times a day, a good latch and pump fit, skin-to-skin contact and a short power pumping plan. See How to Increase Milk Supply, and What Doesn’t Help, and check whether supply is really low with Signs of Low Milk Supply. For herbs and supplements, see Lactation Pills: Side Effects and Safety.
Call your baby’s doctor promptly if your baby has fewer wet diapers than expected, isn’t gaining weight, looks more yellow, or is unusually sleepy.
Quick answers
Can I get domperidone in the U.S.?
Not as an approved medicine. Distribution is generally illegal, apart from limited research programs.
Is domperidone safe for my baby?
Only small amounts reach breast milk, and baby side effects haven’t commonly been reported. The main risks are to the mother’s heart.
How long does domperidone take to work?
In studies, changes usually appeared within days to a couple of weeks, when it helped at all.
Can I stop domperidone suddenly?
Don’t. The FDA has linked stopping or tapering to anxiety, depression and insomnia, so plan it with your prescriber.
Reviewed October 2026. Author: Qingcai Wang, MD, PhD. General education only; this is not advice to start, stop or change any medicine. Talk to your doctor or pharmacist about your situation.
Sources: FDA, Information about domperidone; Academy of Breastfeeding Medicine, Clinical Protocols, including Protocol #9 on galactagogues.