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Related Experiment Videos

Single-dose single-point method in amitriptyline therapy.

S Madakasira, P G Khazanie, T L Sato

    Psychopharmacology
    |January 1, 1984
    PubMed
    Summary

    Predicting amitriptyline (AT) dosage using single-dose plasma levels is reliable for depressed patients. This method helps achieve therapeutic drug concentrations, leading to patient improvement within two weeks.

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    Area of Science:

    • Pharmacology
    • Clinical Psychiatry
    • Therapeutics

    Background:

    • Determining optimal antidepressant dosage is crucial for effective treatment.
    • Amitriptyline (AT) is a commonly prescribed tricyclic antidepressant (TCA).
    • Plasma drug concentration monitoring can guide therapeutic drug use.

    Purpose of the Study:

    • To assess the predictability of amitriptyline (AT) dosage based on single-dose plasma concentrations.
    • To evaluate if single-dose levels can reliably predict steady-state concentrations.
    • To determine the clinical benefit of dose prediction in depressed patients.

    Main Methods:

    • Twenty-one depressed patients were included in the study.
    • Plasma amitriptyline (AT) levels were measured after a single dose (18-hour level).
    • In some patients, dosage was adjusted based on the 18-hour level to achieve a target steady-state concentration of 200 ng/ml.

    Main Results:

    • The 18-hour single-dose level predicted steady-state concentrations in 11 patients.
    • Dose adjustments based on single-dose levels resulted in a mean steady-state concentration of 213 ng/ml in 10 patients.
    • Eighty percent of patients achieved therapeutic plasma levels of amitriptyline.
    • All patients demonstrated clinical improvement within two weeks of treatment.

    Conclusions:

    • Predicting amitriptyline (AT) dosage from a single-dose plasma level is a reliable method.
    • This approach is beneficial for achieving therapeutic drug concentrations in depressed patients.
    • Dose prediction using single-dose TCA levels offers a practical advantage in clinical settings.

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