Diclofenac Use During Breastfeeding
Diclofenac can be used during breastfeeding with minimal risk to the infant, as it transfers into breast milk in very low amounts that are unlikely to cause harm.
Evidence-Based Recommendation
The FDA drug label indicates that diclofenac may be present in human milk, but at clinically insignificant levels 1. In one documented case, a woman taking 150 mg/day had a milk concentration of only 100 mcg/L, translating to an infant dose of approximately 0.03 mg/kg/day 1. More importantly, in 12 women using diclofenac (either 100 mg/day orally for 7 days or a single 50 mg intramuscular dose), the drug was not detectable in breast milk 1.
Recent research from 2024 confirms this safety profile, showing diclofenac has a milk-to-plasma ratio of only 0.093, indicating very low mammary transfer 2. This is substantially lower than many other commonly used medications.
Clinical Guidance
When to Use:
- Short-term pain relief in breastfeeding mothers is appropriate
- Use the lowest effective dose for the shortest duration needed
- Standard analgesic dosing (typically 50-75 mg 2-3 times daily) is acceptable
Important Caveat - Neonatal Jaundice:
Avoid diclofenac (and all NSAIDs) when breastfeeding a neonate with jaundice 3. NSAIDs can displace bilirubin from protein binding sites, potentially worsening hyperbilirubinemia in jaundiced newborns.
Comparison to Other NSAIDs
While the 2009 American Academy of Pediatrics guideline specifically mentions ibuprofen, indomethacin, and naproxen as safe during breastfeeding 3, diclofenac demonstrates even lower milk transfer than these agents. The systematic review from 2026 notes that most NSAIDs have a relative infant dose below 10% (the accepted safety threshold), and diclofenac falls well within this range 4.
Practical Considerations
The FDA label appropriately states that "the developmental and health benefits of breastfeeding should be considered along with the mother's clinical need" 1. Given the minimal transfer documented, this risk-benefit analysis strongly favors continued breastfeeding while using diclofenac for pain management.
For optimal infant safety: Time breastfeeding to avoid peak drug concentrations in milk (typically 2-3 hours after oral dosing), though given the negligible transfer, this precaution may be unnecessary for diclofenac specifically 5.