Diclofenac and Breastfeeding
Diclofenac is safe to use during breastfeeding, as only small amounts are detected in breast milk and it has been used extensively during lactation without demonstrable adverse effects in neonates. 1
Safety Profile
The Association of Anaesthetists 2020 guideline explicitly states that diclofenac is considered safe to use during breastfeeding, with small amounts detected in breast milk after extensive use during lactation. 1
Key Evidence Supporting Safety:
Minimal milk transfer: One study found a milk diclofenac level of 100 mcg/L in a woman taking 150 mg/day orally, equivalent to an infant dose of approximately 0.03 mg/kg/day. 2
Often undetectable: Diclofenac was not detectable in breast milk in 12 women using diclofenac after either 100 mg/day orally for 7 days or a single 50 mg intramuscular dose in the immediate postpartum period. 2
Low milk-to-plasma ratio: Recent research demonstrated a milk-to-plasma drug concentration ratio of only 0.093, indicating very low mammary transfer. 3
Shorter half-life advantage: Compared to naproxen, which has a longer half-life, diclofenac is still widely used and considered safe for breastfeeding mothers. 1
Dosing Recommendations
While the guideline evidence does not specify exact dosing limits for breastfeeding mothers, standard analgesic dosing is appropriate. 1 The FDA label notes that diclofenac may be present in human milk based on available data, and recommends considering the developmental and health benefits of breastfeeding along with the mother's clinical need for the medication. 2
Use the lowest effective dose for the shortest duration necessary, consistent with general NSAID prescribing principles during lactation. 1
Clinical Context
Comparison with Other NSAIDs:
The 2020 guideline places diclofenac among several NSAIDs considered compatible with breastfeeding, including:
- Ibuprofen: Used extensively for postpartum pain, considered safe 1
- Naproxen: Widely used after caesarean section despite longer half-life 1
- Celecoxib, ketorolac, parecoxib: All compatible with breastfeeding 1
Important Caveats:
Neonatal jaundice: Most NSAIDs displace bilirubin and are contraindicated when breastfeeding a neonate with jaundice. 1
Timing considerations: If concerned about minimizing infant exposure, breastfeeding can be timed to avoid peak drug concentrations in milk, though this is generally unnecessary given the low transfer rates. 4
No interruption needed: Breastfeeding may continue as normal without interruption or "pump and dump" periods. 1
Monitoring
No specific infant monitoring is required for diclofenac use during breastfeeding, unlike some opioid analgesics that require observation for sedation or respiratory depression. 1 The extensive clinical experience and favorable safety profile support routine use without special precautions beyond standard NSAID considerations.