Why is codeine not recommended for pediatric analgesia?

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Codeine’s pain relief relies on it being converted to morphine by the liver enzyme CYP2D6. Genetic differences mean some children are ultra-rapid metabolizers and transform codeine into morphine much faster and in larger amounts than expected. This can lead to dangerously high morphine levels, with respiratory depression and serious toxicity, even at standard doses. Because of this unpredictable and potentially life-threatening response, codeine is not recommended for pediatric pain management. Safer options include acetaminophen or ibuprofen for mild to moderate pain, and if an opioid is needed, choosing one with more predictable effects and monitoring closely. The concern is not that codeine is a non-opioid or that it universally causes sedation, nor that it interacts specifically with acetaminophen; the main issue is the variable, sometimes excessive conversion to morphine due to ultra-rapid metabolism.