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Related Experiment Videos

[Pharmacokinetic effects in morphine toxicity, with case examples].

R Morant1, H J Senn

  • 1Abteilung für Onkologie/Hämatologie, Medizinische Klinik C, Kantonsspital St. Gallen.

Schweizerische Rundschau Fur Medizin Praxis = Revue Suisse De Medecine Praxis
|June 25, 1991
PubMed
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Morphine is metabolized by the liver into glucuronides, which are excreted by the kidneys. Renal insufficiency causes toxic metabolite buildup, while liver issues increase oral morphine bioavailability.

Area of Science:

  • Pharmacokinetics
  • Clinical Pharmacology
  • Drug Metabolism

Background:

  • Understanding morphine pharmacokinetics is crucial for safe and effective pain management.
  • Morphine undergoes hepatic transformation into glucuronide metabolites (M3G, M6G).
  • Renal and hepatic function significantly influence morphine metabolite levels and clinical effects.

Observation:

  • Oral morphine is rapidly absorbed and metabolized.
  • Polar metabolites, morphine-3-glucuronide (M3G) and morphine-6-glucuronide (M6G), are renally excreted.
  • Accumulation of active morphine metabolites occurs in renal insufficiency.

Findings:

  • Severe toxic side effects can arise from accumulated morphine metabolites in patients with renal insufficiency.
  • Hepatic insufficiency reduces the first-pass metabolism of oral morphine.

Related Experiment Videos

  • Oral morphine bioavailability is enhanced in hepatic insufficiency.

    • Implications:

    • Dose adjustments and careful monitoring are necessary for patients with renal impairment receiving morphine.
    • Clinicians must consider altered oral morphine bioavailability in patients with hepatic insufficiency.
    • Transitioning from parenteral to oral morphine requires careful consideration of hepatic function.