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Related Experiment Videos

Interindividual differences in amitriptyline demethylation

D E Rollins, G Alván, L Bertilsson

    Clinical Pharmacology and Therapeutics
    |July 1, 1980
    PubMed
    Summary
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    This study investigated amitriptyline (AT) and nortriptyline (NT) pharmacokinetics. Oral administration of AT and NT showed lower systemic availability compared to intramuscular routes, with significant individual variations in AT demethylation.

    Area of Science:

    • Pharmacology
    • Clinical Pharmacokinetics
    • Drug Metabolism

    Background:

    • Amitriptyline (AT) is a widely used antidepressant, metabolized to nortriptyline (NT).
    • Understanding the pharmacokinetic profiles of AT and NT is crucial for optimizing therapeutic outcomes.
    • Individual variability in drug metabolism can significantly impact drug efficacy and safety.

    Purpose of the Study:

    • To compare the pharmacokinetics of amitriptyline (AT) and nortriptyline (NT) following oral and intramuscular administration.
    • To assess the systemic availability and blood-plasma distribution of AT and NT.
    • To investigate the extent and variability of AT demethylation and its correlation with oral drug clearance.

    Main Methods:

    • Six healthy subjects received oral and intramuscular doses of AT and NT.

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  • Blood samples were collected over time to determine drug concentrations.
  • Area Under the Curve (AUC) was calculated to assess drug exposure.
  • Unbound plasma fractions and blood-plasma ratios were determined.
  • Oral drug clearance and systemic availability were calculated.

    • Main Results:

    • Mean unbound fractions in plasma were 5.4% for AT and 8.3% for NT.
    • The blood-plasma ratio for NT was approximately double that of AT.
    • Mean systemic availability of oral versus intramuscular AT was 43%, and for NT was 61%.
    • Oral blood clearance of AT was calculated as 1.6 L/min.
    • Demethylation of oral AT varied from 25% to 89% among subjects and correlated with oral clearance.

    Conclusions:

    • Oral administration of AT and NT results in lower systemic availability compared to intramuscular routes.
    • Significant inter-individual variability exists in the demethylation of AT, influencing its oral clearance.
    • The pharmacokinetic data provide insights into the disposition of AT and its active metabolite NT.