Red flags — call us immediately or go to the Emergency Department if:
- Your baby has fewer than 6 wet nappies per day — (inadequate intake from reduced supply)
- Your baby seems unsatisfied after every feed or is losing weight
- Your milk supply feels noticeably lower than before
- You notice changes in your mood, sleep, or thinking — (contact your mental health team)
- You feel thoughts of hurting yourself or your baby — (call 112 immediately)
- A rash that does NOT fade when you press a clear glass on it — sepsis sign
- Fever in a baby under 3 months (any temperature ≥ 38.0 °C)
- Fast breathing, blue lips, or sucking-in of the ribs — breathing emergency
- A fit/seizure, or your child becomes floppy or unresponsive — general red flag
What aripiprazole is
Aripiprazole (Abilify) is an atypical antipsychotic. Doctors prescribe it for schizophrenia, bipolar disorder, major depression (as an add-on), and sometimes irritability linked to autism. It works differently from most antipsychotics — it is a partial dopamine agonist rather than a full blocker. This difference is important for breastfeeding mothers.
Aripiprazole and your milk supply
Most antipsychotics raise prolactin — the hormone that drives milk production. Aripiprazole does the opposite. Because it is a partial dopamine agonist, it can lower prolactin, and case reports show some breastfeeding mothers on aripiprazole have experienced a noticeable drop in milk supply. This does not happen to every mother, but it is something to watch carefully. If your supply drops after starting aripiprazole, tell your GP, lactation consultant, or your prescribing doctor — your baby's nutrition must be protected.
How much passes into breast milk
Available studies suggest aripiprazole passes into breast milk at a low relative infant dose — approximately 1 % of the mother's weight-adjusted daily dose in most cases. This is very low. However, the evidence base is small. For healthy full-term babies whose supply is adequate, aripiprazole is generally considered low risk. Uncertainty is higher for very young or premature babies.
What to watch for in your baby
Because milk supply may be reduced, the main concern for your baby is inadequate intake rather than direct drug effects. Watch for: fewer than 6 wet nappies per day, an unsatisfied baby after feeds, poor weight gain, or a baby who seems constantly hungry. If you notice these signs, contact your ONE / Kind & Gezin nurse, your midwife, or your GP. A lactation consultant can help you assess supply and decide whether a formula supplement is needed.
Your mental health matters
Aripiprazole is often prescribed because the psychiatric condition it treats is serious. Never stop it without your psychiatrist's or prescribing doctor's guidance. If your mood, thinking, or sleep changes, contact your mental health team immediately — this is especially important in the postpartum period when conditions like bipolar disorder can change quickly.
If anything changes
Watch your milk supply closely — aripiprazole can reduce it. Check your baby has at least 6 wet nappies per day and is gaining weight. Never stop aripiprazole without your doctor's guidance. If you ever have thoughts of harming yourself or your baby, call 112 immediately.
Emergency? Call 112. Do not wait for a reply from us.
If you are not sure, ask
Send us what you are seeing. A few lines are enough to start.
An assistant takes your message. A coordinator reads it. A doctor decides.
Message us on WhatsAppReviewed and signed off by Dr Didier Decamps on 18 September 2026. This is general information and does not replace an individual assessment by a qualified clinician.
Written with AI assistance. Reviewed, corrected and signed by Dr Didier Decamps, paediatrician.
Last reviewed: 18 September 2026