Drug interactions
Fluconazole + Glyburide
Severity: Major
Fluconazole and Glyburide: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Fluconazole raises glyburide levels and prolongs its half-life, increasing the risk of significant hypoglycemia. Severe episodes have been reported with sulfonylureas and azole antifungals.
What this interaction means in plain words
Fluconazole and Glyburide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Fluconazole belongs to Anti Fungals; Glyburide belongs to Endocrine.
Why it happens
Fluconazole inhibits CYP2C9 (and CYP3A4), decreasing glyburide metabolism.
What to do
Monitor blood glucose closely and lower the glyburide dose when starting fluconazole. Consider an alternative antidiabetic or antifungal if hypoglycemia occurs.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Fluconazole
- Dihydroergotamine intranasal + Fluconazole Contraindicated
- Dihydroergotamine + Fluconazole Contraindicated
- Dofetilide + Fluconazole Contraindicated
- Dronedarone + Fluconazole Contraindicated
- Erythromycin + Fluconazole Contraindicated
- Flibanserin + Fluconazole Contraindicated
Other interactions of Glyburide
- Bosentan + Glyburide Contraindicated
- Cholic acid + Glyburide Major
- Ciprofloxacin + Glyburide Major
- Clarithromycin + Glyburide Major
- Glyburide + Insulin degludec-liraglutide Major
- Glyburide + Miconazole Major
Frequently asked questions
Can I take Fluconazole with Glyburide?
MediHelp rates the interaction as major. Fluconazole and Glyburide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Fluconazole raises glyburide levels and prolongs its half-life, increasing the risk of significant hypoglycemia. Severe episodes have been reported with sulfonylureas and azole antifungals.
How serious is the interaction between Fluconazole and Glyburide?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood glucose closely and lower the glyburide dose when starting fluconazole. Consider an alternative antidiabetic or antifungal if hypoglycemia occurs.
What other medicines interact with Fluconazole?
MediHelp also lists interactions of Fluconazole with, for example, Dihydroergotamine intranasal, Dihydroergotamine, Dofetilide. The full list is on the Fluconazole page.
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