Answer
Diphenhydramine, an ingredient in Benylin Four Flu tablets, is not recommended during breastfeeding; it enters human breast milk, although levels after therapeutic doses are not thought high enough to affect the infant.
Sources for this answer
- Benylin Four Flu tabletsMcNeil Products Ltd · emc · SmPC §4.6 Fertility, pregnancy and lactation · Version 22Document updated
Sources checked