- Design
- Descriptive observational study of pharmacovigilance queries
- Population
- 2,473 breastfeeding medication queries to the Lyon centre, 2019–2023
- Primary outcome
- Recommendation given
- Effect
- Breastfeeding supported in 87%; unfavourable advice in 13%; polytherapy in 35%
The Lyon pharmacovigilance centre reviewed all 2,473 queries about medicines and breastfeeding it handled from 2019 to 2023, about 500 a year. Most came from patients themselves (44%), allied health professionals (29%) or specialists (25%).
Advice supported continuing breastfeeding in 87% of cases, sometimes with conditions such as infant monitoring, dose adjustment or timing. Only 13% led to advice to stop either the drug or breastfeeding, because of a formal contraindication, insufficient benefit or limited safety data. Polytherapy, present in 35%, was linked to more restrictive advice. Reported infant adverse effects were rare and not serious.
The common default — stop breastfeeding to be safe — was rarely necessary. Clinicians can usually find a compatible option, and specialist lactation pharmacology resources are worth using before advising a mother to stop.
- Do not advise stopping breastfeeding by default when a mother needs a medicine.
- Check a lactation pharmacology resource before deciding.
- Prefer drugs with established breastfeeding data when choosing among alternatives.
- Take extra care with multiple concurrent medicines, which made advice more restrictive.
- Advise parents what to watch for in the infant when conditions apply.
Why it matters
Unnecessary advice to stop breastfeeding is common and costs mother and infant real benefits.
Don't overread it
These are queries to one specialist centre, which may over-represent complex cases, and the outcomes of the advice were not tracked.
Read the rest in the app
You have read your two free briefings this month. The app carries all 27 specialties, every morning, free — and this finding is waiting in it.
Scan to keep reading on your phone. No account needed to start.
Tomorrow morning, before your first patient
One edition a day for clinical pharmacology, written by the desk, every claim tied to its paper. Six minutes.
Get the app — free