Drug interactions
Haloperidol + Procainamide
Severity: Major
Haloperidol and Procainamide: major interaction.
Last updated
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.
Summary
Procainamide is a class IA antiarrhythmic that prolongs repolarization, and haloperidol also lengthens the QT interval. Together they increase the risk of torsades de pointes and other ventricular arrhythmias.
What this interaction means in plain words
Haloperidol and Procainamide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive QT prolongation through potassium channel blockade and sodium channel effects.
What to do
Avoid the combination if possible and use a non-QT-prolonging antipsychotic or antiarrhythmic. If unavoidable, perform ECG monitoring and correct electrolyte abnormalities.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Haloperidol
- Dofetilide + Haloperidol Contraindicated
- Dronedarone + Haloperidol Contraindicated
- Haloperidol + Ibutilide Contraindicated
- Haloperidol + Levoketoconazole Contraindicated
- Haloperidol + Panobinostat Contraindicated
- Haloperidol + Pimozide Contraindicated
Frequently asked questions
Can I take Haloperidol with Procainamide?
MediHelp rates the interaction as major. Haloperidol and Procainamide can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Procainamide is a class IA antiarrhythmic that prolongs repolarization, and haloperidol also lengthens the QT interval. Together they increase the risk of torsades de pointes and other ventricular arrhythmias.
How serious is the interaction between Haloperidol and Procainamide?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination if possible and use a non-QT-prolonging antipsychotic or antiarrhythmic. If unavoidable, perform ECG monitoring and correct electrolyte abnormalities.
What other medicines interact with Haloperidol?
MediHelp also lists interactions of Haloperidol with, for example, Dofetilide, Dronedarone, Ibutilide. The full list is on the Haloperidol page.
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