Drug interactions
Fluconazole + Gliclazide
Severity: Major
Fluconazole and Gliclazide: 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 gliclazide exposure and can cause prolonged or severe hypoglycemia. Cases of hypoglycemia have been reported with azole antifungals and sulfonylureas.
What this interaction means in plain words
Fluconazole and Gliclazide 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; Gliclazide belongs to Endocrine.
Why it happens
Fluconazole inhibits CYP2C9 and CYP2C19, which metabolize gliclazide, reducing its clearance.
What to do
Monitor blood glucose closely and reduce the gliclazide dose during fluconazole therapy. Consider an alternative antifungal if glycemic control is difficult.
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 Gliclazide
Other interactions of Fluconazole
- Dihydroergotamine intranasal + Fluconazole Contraindicated
- Dihydroergotamine + Fluconazole Contraindicated
- Dofetilide + Fluconazole Contraindicated
- Dronedarone + Fluconazole Contraindicated
- Erythromycin + Fluconazole Contraindicated
- Flibanserin + Fluconazole Contraindicated
Frequently asked questions
Can I take Fluconazole with Gliclazide?
MediHelp rates the interaction as major. Fluconazole and Gliclazide 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 gliclazide exposure and can cause prolonged or severe hypoglycemia. Cases of hypoglycemia have been reported with azole antifungals and sulfonylureas.
How serious is the interaction between Fluconazole and Gliclazide?
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 reduce the gliclazide dose during fluconazole therapy. Consider an alternative antifungal if glycemic control is difficult.
What other medicines interact with Gliclazide?
MediHelp also lists interactions of Gliclazide with, for example, Ciprofloxacin, Clarithromycin, Disopyramide. The full list is on the Gliclazide page.
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