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Theophylline intoxication following viloxazine induced decrease in clearance.

J P Laaban, J P Dupeyron, M Lafay

    European Journal of Clinical Pharmacology
    |January 1, 1986
    PubMed
    Summary
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    Theophylline intoxication occurred because viloxazine significantly reduced the body's ability to clear theophylline. This drug interaction highlights the importance of monitoring theophylline levels when co-administered with viloxazine.

    Area of Science:

    • Pharmacology
    • Clinical Toxicology
    • Drug Interactions

    Background:

    • Theophylline is a medication used for respiratory diseases.
    • Viloxazine is an antidepressant medication.
    • Drug interactions can alter the metabolism and clearance of medications.

    Observation:

    • A patient experienced theophylline intoxication.
    • The intoxication coincided with the administration of viloxazine.
    • Theophylline clearance was markedly reduced in this patient.

    Findings:

    • Concomitant administration of viloxazine caused a significant decrease in theophylline clearance.
    • This decrease in clearance led to elevated theophylline levels and subsequent intoxication.
    • Viloxazine appears to inhibit the metabolic pathways responsible for theophylline elimination.

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    Implications:

    • Clinicians should exercise caution when prescribing viloxazine with theophylline.
    • Therapeutic drug monitoring of theophylline levels is crucial in patients receiving both medications.
    • This case underscores the potential for significant drug interactions impacting patient safety and treatment outcomes.