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• W2013071683 abstract "We examined in vivo the influence of cytochrome P4503A4 (CYP3A4) activity, measured by the 30 min plasma 1'OH-midazolam/midazolam ratio after oral administration of 7.5 mg midazolam, on the methadone steady-state trough plasma concentrations in a group of 32 patients in methadone maintenance treatment. Patients were grouped as receiving 'low' (up to 99 mg/day, n = 10), 'high' (100-199 mg/day, n = 11) and 'very high' (> or = 200 mg/day, n = 11) doses of methadone, and the CYP3A4 metabolic activity was compared between the three groups. (S)-methadone and (R,S)-methadone, but not (R)-methadone, concentrations to dose ratios significantly correlated with the midazolam ratios (r(2) = -0.17, P = 0.018; r(2) = -0.14, P = 0.032; r(2) = -0.10, P = 0.083, respectively), with a 76% higher CYP3A4 activity in the very high-dose group as compared with the low-dose group. Significant differences in the CYP3A4 activity were calculated between the three groups (P = 0.0036), and group-to-group comparisons, using the Bonferroni correction, showed a significant difference between the low-dose and the very high-dose group (P = 0.0039), between the high-dose and the very high-dose group (P = 0.0064), but not between the low-dose and the high-dose group (P = 0.070). The higher CYP3A4 activity measured in patients receiving very high methadone doses could contribute to the need for higher doses in some patients, due to an increased metabolic clearance. This, however, must be confirmed by a prospective study." @default.
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• W2013071683 date "2003-03-01" @default.
• W2013071683 modified "2023-09-24" @default.
• W2013071683 title "Cytochrome P4503A4 metabolic activity, methadone blood concentrations, and methadone doses" @default.
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• W2013071683 doi "https://doi.org/10.1016/s0376-8716(02)00320-4" @default.
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