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Sulfamethoxazole and Sulfonylurea: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Sulfamethoxazole interacts with Sulfonylurea

Sulfamethoxazole inhibits CYP2C9, reducing sulfonylurea metabolism (especially glibenclamide and glipizide) and displacing it from albumin, increasing risk of severe prolonged hypoglycemia.

What you should do

Monitor blood glucose frequently during co-treatment, especially in elderly or renal impairment. Consider temporary sulfonylurea dose reduction or alternative antibiotic.

Key facts

Severity

Moderate — caution required

Mechanism

Sulfamethoxazole inhibits CYP2C9, reducing sulfonylurea metabolism (especially glibenclamide and glipizide) and displaci...

Action

Monitor blood glucose frequently during co-treatment, especially in elderly or renal impairment. Consider temporary sulf...

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 Sulfamethoxazole and Sulfonylurea together?

With caution. Monitor blood glucose frequently during co-treatment, especially in elderly or renal impairment. Consider temporary sulfonylurea dose reduction or alternative antibiotic.

What is the severity of this interaction?

The interaction between Sulfamethoxazole and Sulfonylurea is classified as Moderate — caution required. Sulfamethoxazole inhibits CYP2C9, reducing sulfonylurea metabolism (especially glibenclamide and glipizide) and displacing it from albumin, increasing risk of severe prolonged hypoglycemia.

What should I do if I'm prescribed both?

Monitor blood glucose frequently during co-treatment, especially in elderly or renal impairment. Consider temporary sulfonylurea dose reduction or alternative antibiotic. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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