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Clarithromycin-carbamazepine interaction: a case report

F Albani1, R Riva, A Baruzzi

  • 1Laboratory of Neuropharmacology, University of Bologna, Italy.

Epilepsia
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

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Clarithromycin antibiotic treatment significantly increases carbamazepine (CBZ) levels in patients. This drug interaction, occurring at a metabolic level, necessitates careful monitoring of CBZ concentrations during clarithromycin therapy.

Area of Science:

  • Pharmacology
  • Drug Interactions
  • Clinical Pharmacy

Background:

  • Carbamazepine (CBZ) is an anticonvulsant and mood-stabilizing medication.
  • Macrolide antibiotics are commonly prescribed for bacterial infections.

Observation:

  • A patient on carbamazepine monotherapy received a 10-day course of clarithromycin.
  • Carbamazepine dosage was reduced during the antibiotic treatment period.

Findings:

  • Concomitant clarithromycin administration led to a significant increase in carbamazepine concentration.
  • The carbamazepine concentration-to-dose ratio doubled, indicating reduced drug clearance.
  • Concentrations of the carbamazepine epoxide (CBZ-E) metabolite decreased, suggesting impaired metabolism.

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Implications:

  • Clinically significant drug interaction between clarithromycin and carbamazepine identified.
  • Metabolic pathways are likely involved in this interaction.
  • Healthcare providers should monitor carbamazepine levels closely when co-prescribing with clarithromycin.