Azithromycin and Ondansetron: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Azithromycin interacts with Ondansetron

Both drugs prolong the QT interval through hERG potassium channel blockade, with additive risk of torsades de pointes especially with electrolyte abnormalities.

What you should do

Avoid in patients with congenital long QT, bradycardia, or hypokalemia/hypomagnesemia. Correct electrolytes and consider baseline ECG in high-risk patients.

Key facts

Severity

Moderate — caution required

Mechanism

Both drugs prolong the QT interval through hERG potassium channel blockade, with additive risk of torsades de pointes es...

Action

Avoid in patients with congenital long QT, bradycardia, or hypokalemia/hypomagnesemia. Correct electrolytes and consider...

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 Azithromycin and Ondansetron together?

With caution. Avoid in patients with congenital long QT, bradycardia, or hypokalemia/hypomagnesemia. Correct electrolytes and consider baseline ECG in high-risk patients.

What is the severity of this interaction?

The interaction between Azithromycin and Ondansetron is classified as Moderate — caution required. Both drugs prolong the QT interval through hERG potassium channel blockade, with additive risk of torsades de pointes especially with electrolyte abnormalities.

What should I do if I'm prescribed both?

Avoid in patients with congenital long QT, bradycardia, or hypokalemia/hypomagnesemia. Correct electrolytes and consider baseline ECG in high-risk patients. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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