Drug interactions
Chlorpromazine + Vandetanib
Severity: Contraindicated
Chlorpromazine and Vandetanib: contraindicated 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
Vandetanib causes marked, dose-related QT prolongation and has a boxed warning for torsades de pointes and sudden death. Adding chlorpromazine, which also prolongs QT, further increases this risk.
What this interaction means in plain words
Chlorpromazine and Vandetanib are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Chlorpromazine belongs to Central Nervous System; Vandetanib belongs to Oncology.
Why it happens
Additive blockade of cardiac potassium channels leading to QT prolongation.
What to do
Avoid concurrent use and choose a non-QT-prolonging alternative to chlorpromazine. If it cannot be avoided, perform frequent ECG monitoring and keep potassium, magnesium and calcium normal.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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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 Vandetanib
- Amiodarone + Vandetanib Contraindicated
- Amisulpride + Vandetanib Contraindicated
- Amitriptyline + Vandetanib Contraindicated
- Anagrelide + Vandetanib Contraindicated
- Asenapine + Vandetanib Contraindicated
- Chloroquine + Vandetanib Contraindicated
Frequently asked questions
Can I take Chlorpromazine with Vandetanib?
MediHelp rates the interaction as contraindicated. Chlorpromazine and Vandetanib are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Vandetanib causes marked, dose-related QT prolongation and has a boxed warning for torsades de pointes and sudden death. Adding chlorpromazine, which also prolongs QT, further increases this risk.
How serious is the interaction between Chlorpromazine and Vandetanib?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use and choose a non-QT-prolonging alternative to chlorpromazine. If it cannot be avoided, perform frequent ECG monitoring and keep potassium, magnesium and calcium normal.
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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