Glyburide and Sulfamethoxazole Trimethoprim: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Glyburide interacts with Sulfamethoxazole Trimethoprim

Sulfamethoxazole displaces glyburide from plasma protein binding and inhibits its CYP2C9 metabolism, increasing free sulfonylurea levels and the risk of hypoglycemia.

What you should do

Monitor blood glucose closely and educate the patient on hypoglycemia symptoms; adjust sulfonylurea dose during co-treatment, especially in the elderly or those with renal impairment.

Key facts

Severity

Moderate — caution required

Mechanism

Sulfamethoxazole displaces glyburide from plasma protein binding and inhibits its CYP2C9 metabolism, increasing free sul...

Action

Monitor blood glucose closely and educate the patient on hypoglycemia symptoms; adjust sulfonylurea dose during co-treat...

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 Glyburide and Sulfamethoxazole Trimethoprim together?

With caution. Monitor blood glucose closely and educate the patient on hypoglycemia symptoms; adjust sulfonylurea dose during co-treatment, especially in the elderly or those with renal impairment.

What is the severity of this interaction?

The interaction between Glyburide and Sulfamethoxazole Trimethoprim is classified as Moderate — caution required. Sulfamethoxazole displaces glyburide from plasma protein binding and inhibits its CYP2C9 metabolism, increasing free sulfonylurea levels and the risk of hypoglycemia.

What should I do if I'm prescribed both?

Monitor blood glucose closely and educate the patient on hypoglycemia symptoms; adjust sulfonylurea dose during co-treatment, especially in the elderly or those with renal impairment. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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