Drug interactions
haloperidol + methadone
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Overview
Additive QT prolongation → torsades risk.
Mechanism of action
QT-prolonging synergy.
Clinical management
Avoid or monitor ECG and electrolytes.
Drug reference
References
Frequently asked questions
Can I take haloperidol with methadone?
The interaction is rated: Major. Additive QT prolongation → torsades risk.
How serious is the interaction between haloperidol and methadone?
The interaction is rated: Major. Evidence level: Moderate.
How is the interaction between haloperidol and methadone managed?
Avoid or monitor ECG and electrolytes.
Why do haloperidol and methadone interact?
QT-prolonging synergy.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.