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Related Experiment Videos

Buprenorphine kinetics

R E Bullingham, H J McQuay, A Moore

    Clinical Pharmacology and Therapeutics
    |November 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    This study examined buprenorphine drug kinetics in surgical patients. Buprenorphine demonstrated rapid systemic availability via intramuscular injection, with similar plasma levels to intravenous administration within 10 minutes.

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    Area of Science:

    • Pharmacology
    • Anesthesiology
    • Clinical Pharmacy

    Background:

    • Buprenorphine is an opioid analgesic used for pain management.
    • Understanding its pharmacokinetic profile is crucial for optimizing its use in surgical settings.
    • Radioimmunoassay is a sensitive method for quantifying drug plasma concentrations.

    Purpose of the Study:

    • To determine the pharmacokinetic parameters of buprenorphine in surgical patients.
    • To compare the kinetics of buprenorphine administered intravenously versus intramuscularly for postoperative pain relief.
    • To assess the influence of the anesthetized state on buprenorphine clearance.

    Main Methods:

    • Plasma buprenorphine concentrations were measured using radioimmunoassay in 24 surgical patients.

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  • Patients received 0.3 mg buprenorphine intraoperatively.
  • Postoperatively, 10 patients received an additional 0.3 mg intravenously, and 11 received it intramuscularly, with plasma levels monitored for 3 hours.

    • Main Results:

    • Buprenorphine plasma concentration data closely fitted a triexponential decay curve.
    • The initial elimination half-life (t1/2) was very fast (2 minutes), with a slow terminal t1/2 of approximately 3 hours.
    • Intramuscular buprenorphine showed rapid systemic availability, achieving peak plasma levels within 2-5 minutes.
    • Plasma levels after 10 minutes were comparable between intravenous and intramuscular routes.
    • Buprenorphine clearance was significantly lower in anesthetized patients compared to awake states.

    Conclusions:

    • Buprenorphine exhibits biphasic elimination kinetics with rapid initial distribution and slower terminal elimination.
    • Intramuscular administration provides rapid and comparable systemic availability to intravenous injection for postoperative pain management.
    • Anesthesia reduces buprenorphine clearance, suggesting potential for altered drug disposition in surgical patients.