This study determined whether SLC22A1 (encoding the organic cation transporter 1 (OCT1)) genotype could explain, in addition to postmenstrual age (PMA) (referring to gestational plus postnatal age) and CYP2D6 genotype, the tramadol (M) pharmacokinetic variability in early infancy.
Matic, M., de Wildt, S. N., Elens, L., de Hoon, J. N., Annaert, P., Tibboel, D., van Schaik, R. H., & Allegaert, K. (2016). SLC22A1 /OCT1 genotype affects O-desmethyltramadol exposure in new-born infants. Therapeutic Drug Monitoring, EPub(AOP), 1. https://doi.org/10.1097/FTD.0000000000000307 (Original work published 2016)