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Potential fluconazole-induced carbamazepine toxicity.

D R Nair¹, H H Morris

¹Department of Epilepsy, Cleveland Clinic Foundation, OH 44195, USA. naird@cesmtp.ccf.org

The Annals of Pharmacotherapy

|August 31, 1999

Summary

Fluconazole can cause carbamazepine toxicity by inhibiting the cytochrome P450 3A4 isoenzyme. This drug interaction led to a patient experiencing stupor, which resolved after discontinuing fluconazole.

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Area of Science:

Pharmacology
Clinical Toxicology

Background:

Carbamazepine is an anticonvulsant medication with a narrow therapeutic index.
Drug interactions are a significant concern in managing patients on carbamazepine therapy.

Observation:

A 33-year-old male patient developed carbamazepine toxicity, presenting as stupor, after initiating fluconazole treatment.
The patient had stable carbamazepine levels prior to fluconazole initiation.
Discontinuation of both medications and subsequent reintroduction of carbamazepine alone led to resolution of toxicity and no further adverse events.

Findings:

Carbamazepine is primarily metabolized by the cytochrome P450 3A4 (CYP3A4) isoenzyme.
Fluconazole is known to inhibit CYP3A4 activity.
This inhibition likely led to decreased carbamazepine metabolism and subsequent toxicity.

Implications:

Clinicians should be aware of the potential for fluconazole to increase carbamazepine levels.
Monitoring carbamazepine concentrations is crucial when co-administering with CYP3A4 inhibitors like fluconazole.
This interaction highlights the importance of considering drug metabolism pathways when prescribing multiple medications.

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