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Related Experiment Videos

Syncopal episodes associated with cisapride and concurrent drugs

V S Gray1

  • 1Department of Pharmacy Practice, McWhorter School of Pharmacy, Samford University, Birmingham, AL 35229, USA.

The Annals of Pharmacotherapy
|June 26, 1998
PubMed
Summary

Concomitant use of cisapride with CYP3A4 inhibitors like clarithromycin can cause QT prolongation and fainting. This drug interaction poses a risk for serious cardiac events.

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Area of Science:

  • Pharmacology
  • Cardiology
  • Drug Interactions

Background:

  • QT prolongation is a known adverse effect of certain medications.
  • Drug interactions can lead to unpredictable and dangerous patient outcomes.

Observation:

  • A 53-year-old woman experienced syncopal episodes and motor vehicle accidents.
  • These episodes were linked to QT prolongation.
  • Cardiac and neurologic evaluations were inconclusive for other causes.

Findings:

  • The patient's syncopal episodes were attributed to QT prolongation caused by the combined use of cisapride and clarithromycin.
  • Clarithromycin inhibits CYP3A4, an enzyme crucial for cisapride metabolism.
  • This inhibition leads to increased cisapride levels, elevating the risk of QT prolongation.

Implications:

  • This case highlights the risk of QT prolongation from cisapride when co-administered with CYP3A4 inhibitors.
  • Awareness of such drug combinations is crucial for preventing potentially fatal cardiac events.
  • Healthcare providers must carefully monitor patients on cisapride for drug interactions.

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