Substrate of CYP 3A4. Inhibitor os CYPs 3A4, 2D6, 1A1, 1A2, 2B6, 2C19, 2C8, 2C9, 2E1. Several references consider it safe. Significant clinical experience points to non-porphyrinogenicity.
Chemical description
Partial opioid antagonist used in postoperative pain and in Sweden also repeatedly in acute porphyric crises. Metabolized by CYP 3A4. MFM James, RJ Hift. Porphyrias. Br J Anaesth 2000; 85, 143-53: use EPI-list: safe Australian list: safe. South African list: use French list: use Without adverse reaction frequently used during acute porphyric crises (Sweden).
IPNet drug reports
Uneventful use reported in 6 patients with acute porphyria.
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