Is it safe for a breastfeeding mother to use Difflam lozenges (benzydamine hydrochloride) for a sore throat?

Difflam Lozenges and Breastfeeding Safety

Difflam lozenges (benzydamine hydrochloride) can be used during breastfeeding, but you should ask a healthcare professional before use, as stated in the FDA labeling. 1

Key Considerations

The FDA drug label for Difflam specifically advises: "If pregnant or breast-feeding, ask a health professional before use" 1. This precautionary statement reflects the lack of specific human data on benzydamine hydrochloride excretion into breast milk and infant exposure.

What We Know About Benzydamine

• Mechanism: Benzydamine is a topical NSAID with analgesic, anesthetic, and antimicrobial properties used for sore throat and oral inflammation 2, 3
• Lipophilic nature: The drug has high affinity for cell membranes, which could theoretically affect milk transfer 2
• Local action: It works primarily through local anti-inflammatory effects rather than systemic absorption 2

Clinical Decision Framework

For a breastfeeding mother with sore throat:

1. First-line alternatives: Consider simple analgesics with established breastfeeding safety profiles

   • NSAIDs like ibuprofen and naproxen are confirmed safe during breastfeeding 4
   • These have extensive safety data in lactation

2. If benzydamine is chosen:

   • Use the lowest effective dose
   • Monitor the infant for any unusual symptoms
   • The topical/local application likely results in minimal systemic absorption and breast milk transfer
   • Given its local mechanism of action, infant exposure is expected to be very low

Important Caveats

• No published lactation data: Unlike medications with established relative infant dose (RID) calculations, benzydamine lacks specific breast milk concentration studies
• General NSAID guidance: Most NSAIDs are compatible with breastfeeding when the RID is <10% 5, but this hasn't been established for benzydamine
• Topical advantage: The oromucosal/topical route of administration suggests minimal systemic maternal levels, which would further limit milk transfer

Bottom line: While not contraindicated, the absence of specific lactation data means you should discuss with the mother whether the benefit of symptom relief outweighs the theoretical unknown risk, particularly when safer alternatives with established breastfeeding compatibility exist.