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Related Experiment Videos

Toxicological studies in a Distalgesic addict.

I Roberts, R J Flanagan, J Strang

    Human Toxicology
    |May 1, 1986
    PubMed
    Summary

    This study investigated paracetamol and dextropropoxyphene pharmacokinetics in an individual with high daily intake. Despite massive paracetamol ingestion, no significant liver damage was observed.

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    Area of Science:

    • Pharmacology
    • Toxicology
    • Clinical Pharmacy

    Background:

    • Investigating the pharmacokinetics of paracetamol and dextropropoxyphene in individuals with high-dose consumption is crucial for understanding drug disposition and potential toxicity.
    • Distalgesic, a combination of paracetamol and dextropropoxyphene, is frequently used for pain management, necessitating studies on its metabolic profile under varying intake levels.

    Observation:

    • A single oral dose of 15 Distalgesic tablets was administered to an individual claiming daily intake of 80-100 tablets.
    • Plasma concentrations of paracetamol, dextropropoxyphene, and their metabolites were monitored.
    • Peak plasma concentrations for paracetamol and dextropropoxyphene were observed at 15 and 30 minutes, respectively.

    Findings:

    • Paracetamol exhibited a rapid absorption and an elimination half-life of 2.3 hours.
    • Nordextropropoxyphene reached very high steady-state plasma concentrations (5 mg/l).
    • Total urinary recovery of paracetamol was 31% of the administered dose, with no abnormal excretion patterns for paracetamol or its metabolites.

    Implications:

    • Despite ingesting 97.5 g of paracetamol over 11 days, the subject showed no biochemical evidence of paracetamol-induced liver injury, apart from elevated gamma-glutamyltransferase.
    • The study highlights the complex pharmacokinetic profile of dextropropoxyphene and its metabolite nordextropropoxyphene at high doses.
    • Further research is warranted to elucidate the mechanisms of tolerance or resistance to paracetamol hepatotoxicity in chronic high-dose users.

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