[Comment] Expression of Concern: Pharmacogenetics of morphine poisoning in a breastfed neonate of a codeine-prescribed mother

00:00 - 03 Feb 2026

Following the publication of this Case Report by Gideon Koren and colleagues1 in 2006, concerns were raised about its interpretation by D Nicholas Bateman and colleagues and we published a Correspondence exchange and an accompanying Comment in 2008.2–4 In 2020, further doubts about the plausibility were raised by David N Juurlink, who asked us to retract the paper and subsequently outlined in a Mini-Review5 together with his colleague Jonathan Zipursky his reasoning for the implausibility of this infant's death being caused through codeine in breastmilk.