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- W2119794123 abstract "Abstract Methadone is used as an alternative opioid when first line opioids fail to provide adequate pain control. Highly variable morphine:methadone dose ratios make switching challenging and little is known about the pharmacokinetics of long lasting methadone treatment for pain. Twelve patients treated with morphine for chronic non‐malignant pain were switched to methadone. Seven of these patients continued with methadone throughout the nine months study period and only minor dose adjustments were performed. Serum concentrations of morphine, methadone and their metabolites were measured at baseline, day one and two, after dose titration and one week, five weeks, three months and nine months after the end of dose titration. Serum concentrations of methadone and its metabolite EDDP did not change significantly from the end of dose titration and during the nine months (repeated measures ANOVA: p = 0.88 and p = 0.06). Very low correlation between dose ratios and serum concentration ratios between morphine and methadone was observed. Large interindividual differences in serum concentrations and metabolism were observed. Our findings contradict that autoinduction of methadone metabolism takes place during long term treatment and supports that a 3‐day opioid switch from morphine to methadone followed by a one week titration seems pharmacologically sound." @default.
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- W2119794123 date "2007-08-01" @default.
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- W2119794123 title "Long term methadone for chronic pain: A pilot study of pharmacokinetic aspects" @default.
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- W2119794123 doi "https://doi.org/10.1016/j.ejpain.2006.09.006" @default.
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