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Protriptyline plasma levels and antidepressant response.

J T Biggs, V E Ziegler

    Clinical Pharmacology and Therapeutics
    |September 1, 1977
    PubMed
    Summary
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    Higher protriptyline plasma levels correlate with better outcomes in depressed patients. Patients with levels above 70 ng/ml showed greater improvement on depression scales after 4 weeks of treatment.

    Area of Science:

    • Pharmacology
    • Psychiatry
    • Clinical Therapeutics

    Background:

    • Depression is a significant global health concern.
    • Antidepressant medication efficacy can vary among individuals.
    • Establishing therapeutic plasma level ranges is crucial for optimizing treatment.

    Purpose of the Study:

    • To investigate the relationship between protriptyline plasma concentrations and treatment outcomes in depressed outpatients.
    • To determine if a specific therapeutic window exists for protriptyline based on plasma levels.

    Main Methods:

    • Twenty-one outpatients diagnosed with depression received 20 mg/day of protriptyline for 4 weeks.
    • Protriptyline plasma concentrations were measured at week 4.
    • Depression severity was assessed using the Hamilton Rating Scale (HRS) and Zung Self-Rating Depression Scale.

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    Main Results:

    • Protriptyline plasma levels ranged from 22 to 167 ng/ml after 4 weeks.
    • A negative correlation was observed between HRS scores and week 4 protriptyline concentration (r = -0.50, p < 0.05).
    • Patients with week 4 plasma levels >70 ng/ml demonstrated significantly better outcomes on both HRS and Zung scales (p < 0.05) compared to those with lower levels.

    Conclusions:

    • Higher protriptyline plasma concentrations are associated with improved treatment outcomes in depressed patients.
    • A threshold of approximately 70 ng/ml may indicate a more favorable therapeutic response.
    • This study did not identify an upper limit for therapeutic protriptyline plasma levels.