The oral-to-intravenous equianalgesic ratio of morphine based on plasma concentrations of morphine and metabolites in advanced cancer patients receiving chronic morphine treatment

Masahiko Takahashi, Takeshi Ohara, Hiroyuki Yamanaka, Akira Shimada, Toshimichi Nakaho, Makoto Yamamuro

研究成果: Article査読

19 被引用数 (Scopus)

抄録

To provide additional pharmacokinetic evidence for the oral-to-parenteral relative potency ratio of 1:2 to 1:3 for chronic morphine use in a palliative care setting, we determined the plasma concentrations of morphine and its major metabolites, morphine-3-glucuronide (M3G) and morphine-6-glucuronide (M6G), in hospitalized advanced cancer patients maintained on long-term oral or intravenous morphine. There were significant linear correlations between daily doses of morphine and plasma concentrations (molar base) of morphine, M3G and M6G for both routes of administration. The oral-to-intravenous relative ratios of the regression coefficients were 2.9 for morphine and 1.8 for morphine+M6G. The morphine kinetic variables were not significantly influenced by any hepato-renal biochemical markers. These results support the commonly used oral-to-intravenous relative potency ratio of 1:2 to 1:3 in patients with cancer pain receiving chronic morphine treatment.

本文言語English
ページ(範囲)673-678
ページ数6
ジャーナルPalliative Medicine
17
8
出版ステータスPublished - 2003

ASJC Scopus subject areas

  • 麻酔学および疼痛医療

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