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- W2059391489 abstract "Hydrocodone combined with acetaminophen is commonly used for moderate pain. Hydrocodone is metabolized by cytochrome P450 (CYP) 2D6 into hydromorphone and by CYP3A4 into norhydrocodone. This was a retrospective study evaluating hydrocodone, hydromorphone and norhydrocodone distributions in urine. Urine specimens (n = 76,924) were obtained from patients on chronic opioid therapy during their first or single visit and were analyzed by liquid chromatography–tandem mass spectrometry (LC–MS-MS). The patients were at least 16 years of age and had documented hydrocodone use via a medication list. There were 48,710 specimens that were positive for all three analytes. Mean hydrocodone, hydromorphone and norhydrocodone mole fractions (95% confidence interval) were 0.39 (0.38–0.39), 0.12 (0.11–0.12) and 0.49 (0.48–0.49), respectively. Hydromorphone fractions were lower in women compared with men (0.11 versus 0.13; P < 0.0001). Hydrocodone mole fractions were higher in the 65-year and older age group compared with the 16- to 39-year age group (0.4 versus 0.36; P ≤ 0.005). Concurrent use of a CYP2D6 and/or CYP3A4 inhibitor altered hydromorphone and norhydrocodone mole fractions, compared with the control group. Patient factors affect hydrocodone and metabolite mole fractions and suggest increased awareness of their contribution when attempting to interpret urine drug testing results." @default.
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- W2059391489 date "2014-05-17" @default.
- W2059391489 modified "2023-10-18" @default.
- W2059391489 title "Urinary Hydrocodone and Metabolite Distributions in Pain Patients" @default.
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- W2059391489 doi "https://doi.org/10.1093/jat/bku051" @default.
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