RT Journal Article SR Electronic T1 Safety of codeine during breastfeeding JF Canadian Family Physician JO Can Fam Physician FD The College of Family Physicians of Canada SP 33 OP 35 VO 53 IS 1 A1 Madadi, Parvaz A1 Koren, Gideon A1 Cairns, James A1 Chitayat, David A1 Gaedigk, Andrea A1 Leeder, J. Steven A1 Teitelbaum, Ronni A1 Karaskov, Tatyana A1 Aleksa, Katarina YR 2007 UL http://www.cfp.ca/content/53/1/33.abstract AB QUESTION Recently a newborn died from morphine poisoning when hismother used codeine while breastfeeding. Many patients receive codeine for postlabour pain. Is it safe to prescribe codeine for nursing mothers? ANSWER When a mother is an ultrarapid metabolizer of cytochrome P450 2D6, she produces much more morphine when taking codeine than most people do. In this situation, newborns might be exposed to toxic levels of morphine when breastfeeding. Options to reduce this risk include discontinuing codeine after 2 to 3 days of use and being aware of symptoms of potential opioid toxicity in both mothers and newborns.