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Related Experiment Videos

Amitriptyline plasma levels and therapeutic response

V E Ziegler, B T Co, J R Taylor

    Clinical Pharmacology and Therapeutics
    |June 1, 1976
    PubMed
    Summary
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    Higher plasma levels of amitriptyline correlate with improved depression symptoms. This study found that total tricyclic plasma levels between 0 and 250 ng/ml were negatively correlated with depression scores, indicating better outcomes with higher therapeutic drug levels.

    Area of Science:

    • Pharmacology
    • Psychiatry
    • Clinical Chemistry

    Background:

    • Depression is a significant mental health disorder requiring effective treatment.
    • Amitriptyline is a commonly prescribed tricyclic antidepressant.
    • Therapeutic drug monitoring is crucial for optimizing antidepressant efficacy and safety.

    Purpose of the Study:

    • To investigate the relationship between plasma levels of amitriptyline and its metabolite, nortriptyline, and clinical improvement in depressed outpatients.
    • To determine the optimal therapeutic plasma concentration range for amitriptyline.

    Main Methods:

    • Eighteen depressed outpatients received amitriptyline treatment for 6 weeks.
    • Clinical improvement was assessed using the Hamilton Depression Rating Scale by blinded psychiatrists.

    Related Experiment Videos

  • Plasma concentrations of amitriptyline and nortriptyline were measured twice weekly using gas chromatography-mass fragmentography.

    • Main Results:

    • A significant negative correlation was observed between Hamilton Depression Rating Scale scores and mean total tricyclic plasma levels (p < 0.01) and amitriptyline levels (p < 0.005).
    • Patients with mean total tricyclic levels above 95 ng/ml showed significantly lower median Hamilton scores at weeks 3 and 6.
    • Recovery rates increased significantly with rising plasma levels up to 250 ng/ml.

    Conclusions:

    • Therapeutic drug monitoring of amitriptyline plasma levels is valuable for managing depression.
    • Higher plasma concentrations of amitriptyline, within the studied range, are associated with greater clinical improvement.
    • The findings support optimizing amitriptyline dosage to achieve target plasma levels for enhanced treatment outcomes.