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Amiodarone interaction with lidocaine

J B Siegmund1, J H Wilson, T E Imhoff

  • 1Good Samaritan Hospital, Cincinnati, OH 45220.

Journal of Cardiovascular Pharmacology
|April 1, 1993
PubMed
Summary
This summary is machine-generated.

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A case study reveals a dangerous drug interaction between amiodarone and lidocaine. Amiodarone can increase lidocaine levels, leading to toxicity and seizures, highlighting the need for careful monitoring.

Area of Science:

  • Pharmacology
  • Clinical Toxicology
  • Drug Interactions

Background:

  • Lidocaine is a commonly used antiarrhythmic and local anesthetic.
  • Amiodarone is a potent antiarrhythmic drug with a complex pharmacokinetic profile.
  • Potential drug interactions between amiodarone and other medications are a significant clinical concern.

Observation:

  • A patient developed lidocaine toxicity, including seizures, after initiating amiodarone therapy.
  • Toxic lidocaine levels and decreased lidocaine clearance were observed 65 hours post-amiodarone initiation.
  • This represents the first documented instance of amiodarone causing increased lidocaine levels and toxicity.

Findings:

  • Amiodarone significantly alters the metabolism of lidocaine.
  • The interaction appears to be mediated by amiodarone-induced changes in hepatic enzyme activity.

Related Experiment Videos

  • Reduced clearance of lidocaine contributes to its accumulation and toxicity.

    • Implications:

    • Clinicians should exercise caution when co-prescribing amiodarone and lidocaine.
    • Close monitoring of lidocaine levels and clinical signs of toxicity is crucial in patients receiving both drugs.
    • This interaction underscores the importance of understanding drug metabolism pathways and potential interactions in clinical practice.