J W Findlay et al.
Clinical pharmacology and therapeutics, 29(5), 625-633 (1981-05-01)
The disposition of salicylic acid, phenacetin, caffeine, and codeine, and two metabolites, acetaminophen and morphine, was studied in breast milk and plasma of two lactating mothers after single oral doses of a compound analgesic. Salicylic acid penetrated poorly into milk