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Derangement of warfarin anticoagulation by miconazole oral gel
M N Pemberton1, P Sloan, S Ariyaratnam
1Clinical Academic Group of Oral Medicine and Dental Diagnostic Science, University Dental Hospital of Manchester.
British Dental Journal
|March 7, 1998
Abstract:
The potentiation of the anticoagulant effects of warfarin by miconazole, when used in oral gel form, is described in three patients. The associated morbidity is examined, emphasising the importance of considering this potentially serious interaction when prescribing antifungal agents to patients on oral anticoagulants.
Insights
Miconazole oral gel significantly increases warfarin's anticoagulant effect, posing a serious risk. Healthcare providers must monitor patients closely for bleeding complications during co-administration.
Area of Science:
- Pharmacology
- Drug Interactions
- Clinical Medicine
Background:
- Warfarin is a widely prescribed oral anticoagulant.
- Miconazole is an antifungal agent available in various formulations.
- Drug interactions can alter the efficacy and safety of medications.
Observation:
- Three patients experienced potentiation of anticoagulant effects when using miconazole oral gel concurrently with warfarin.
- This interaction led to increased morbidity in the observed cases.
Findings:
- Concomitant use of miconazole oral gel and warfarin can lead to a dangerous increase in anticoagulation.
- The oral gel formulation of miconazole appears to be implicated in this interaction.
Implications:
- Clinicians must be aware of this significant drug interaction.
- Careful monitoring for bleeding is essential in patients receiving both miconazole oral gel and warfarin.
- Alternative antifungal therapies or dose adjustments of warfarin may be necessary.