Drug interactions
Chlorpromazine + Quizartinib
Severity: Major
Chlorpromazine and Quizartinib: major interaction.
Last updated Sources: UK SmPC
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
Quizartinib causes dose-related QT prolongation, and labeling advises caution with other QT-prolonging drugs. Chlorpromazine adds to this effect and may increase the risk of torsades de pointes.
What this interaction means in plain words
Chlorpromazine and Quizartinib 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.
Chlorpromazine belongs to Central Nervous System; Quizartinib belongs to Oncology.
Why it happens
Additive QT prolongation via cardiac repolarization (hERG) potassium channel inhibition.
What to do
Avoid the combination where possible, or monitor ECG more frequently and keep potassium and magnesium normal. Reduce the quizartinib dose or interrupt treatment if QTc becomes markedly prolonged.
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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References
Other interactions of Chlorpromazine
- Chlorpromazine + Dofetilide Contraindicated
- Chlorpromazine + Dronedarone Contraindicated
- Chlorpromazine + Droperidol Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Chlorpromazine + Metrizamide Contraindicated
- Chlorpromazine + Panobinostat Contraindicated
Other interactions of Quizartinib
- Quizartinib + Thioridazine Contraindicated
- Quizartinib + Ziprasidone Contraindicated
- Alfuzosin + Quizartinib Major
- Amiodarone + Quizartinib Major
- Amitriptyline + Quizartinib Major
- Amobarbital + Quizartinib Major
Frequently asked questions
Can I take Chlorpromazine with Quizartinib?
MediHelp rates the interaction as major. Chlorpromazine and Quizartinib 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. Quizartinib causes dose-related QT prolongation, and labeling advises caution with other QT-prolonging drugs. Chlorpromazine adds to this effect and may increase the risk of torsades de pointes.
How serious is the interaction between Chlorpromazine and Quizartinib?
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 where possible, or monitor ECG more frequently and keep potassium and magnesium normal. Reduce the quizartinib dose or interrupt treatment if QTc becomes markedly prolonged.
What other medicines interact with Chlorpromazine?
MediHelp also lists interactions of Chlorpromazine with, for example, Dofetilide, Dronedarone, Droperidol. The full list is on the Chlorpromazine page.
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