Haloperidol and Ondansetron: Drug Interaction Guide

Quick answer: This is a major interaction — avoid combining Haloperidol and Ondansetron unless specifically directed by your doctor.

Interaction severity: Major — avoid combination

How Haloperidol interacts with Ondansetron

Both drugs prolong the QT interval through hERG potassium channel blockade, additively increasing risk of torsades de pointes.

What you should do

Avoid combination, especially with electrolyte abnormalities. If unavoidable, perform baseline ECG, correct hypokalemia/hypomagnesemia, and monitor QTc.

Key facts

Severity

Major — avoid combination

Mechanism

Both drugs prolong the QT interval through hERG potassium channel blockade, additively increasing risk of torsades de po...

Action

Avoid combination, especially with electrolyte abnormalities. If unavoidable, perform baseline ECG, correct hypokalemia/...

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 Haloperidol and Ondansetron together?

No — this combination should generally be avoided. Avoid combination, especially with electrolyte abnormalities. If unavoidable, perform baseline ECG, correct hypokalemia/hypomagnesemia, and monitor QTc.

What is the severity of this interaction?

The interaction between Haloperidol and Ondansetron is classified as Major — avoid combination. Both drugs prolong the QT interval through hERG potassium channel blockade, additively increasing risk of torsades de pointes.

What should I do if I'm prescribed both?

Avoid combination, especially with electrolyte abnormalities. If unavoidable, perform baseline ECG, correct hypokalemia/hypomagnesemia, and monitor QTc. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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