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Related Experiment Videos

Interaction between quinidine and digoxin.

E B Leahey, J A Reiffel, R E Drusin

    JAMA
    |August 11, 1978
    PubMed
    Summary

    Quinidine therapy significantly increases serum digoxin levels in patients, leading to potential toxicity symptoms like nausea and vomiting. Close monitoring of digoxin levels and patient condition is crucial when initiating quinidine.

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    Area of Science:

    • Pharmacology
    • Cardiology

    Background:

    • Digoxin is a cardiac glycoside used to treat heart failure and arrhythmias.
    • Quinidine is an antiarrhythmic agent that can interact with other medications.

    Purpose of the Study:

    • To investigate the effect of quinidine therapy on serum digoxin concentrations.
    • To assess the clinical implications of this drug interaction.

    Main Methods:

    • Serum digoxin levels were measured before and during quinidine therapy in 27 patients.
    • Clinical symptoms and electrocardiograms (ECGs) were monitored.

    Main Results:

    • Serum digoxin concentration increased in 93% of patients, from a mean of 1.4 ng/ml to 3.2 ng/ml.
    • Gastrointestinal symptoms (anorexia, nausea, vomiting) occurred in 59% of patients, resolving with digoxin dose reduction.
    • New cardiac arrhythmias, including ventricular premature depolarizations and ventricular tachycardia, were observed.

    Conclusions:

    • Quinidine significantly elevates serum digoxin levels, increasing the risk of digoxin toxicity.
    • Concurrent use of quinidine and digoxin necessitates close monitoring of clinical status, ECG, and serum digoxin levels.

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