Fluconazole and Sulfonylurea: Drug Interaction Guide

Quick answer: This combination requires caution. Fluconazole and Sulfonylurea can be used together with adjustments and monitoring.

Interaction severity: Moderate — caution required

How Fluconazole interacts with Sulfonylurea

Fluconazole inhibits CYP2C9, reducing the metabolism of sulfonylureas (e.g., glimepiride, glipizide, glibenclamide) and increasing the risk of prolonged hypoglycaemia.

What you should do

Monitor blood glucose closely when initiating fluconazole; reduce the sulfonylurea dose if hypoglycaemia occurs and counsel the patient on warning symptoms.

Key facts

Severity

Moderate — caution required

Mechanism

Fluconazole inhibits CYP2C9, reducing the metabolism of sulfonylureas (e.g., glimepiride, glipizide, glibenclamide) and ...

Action

Monitor blood glucose closely when initiating fluconazole; reduce the sulfonylurea dose if hypoglycaemia occurs and coun...

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Fluconazole and Sulfonylurea together?

With caution. Monitor blood glucose closely when initiating fluconazole; reduce the sulfonylurea dose if hypoglycaemia occurs and counsel the patient on warning symptoms.

What is the severity of this interaction?

The interaction between Fluconazole and Sulfonylurea is classified as Moderate — caution required. Fluconazole inhibits CYP2C9, reducing the metabolism of sulfonylureas (e.g., glimepiride, glipizide, glibenclamide) and increasing the risk of prolonged hypoglycaemia.

What should I do if I'm prescribed both?

Monitor blood glucose closely when initiating fluconazole; reduce the sulfonylurea dose if hypoglycaemia occurs and counsel the patient on warning symptoms. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.