Drug interactions
Quetiapine + Vandetanib
Severity: Major
Quetiapine and Vandetanib: 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
Vandetanib causes marked, dose-related QT prolongation and torsades de pointes, and quetiapine can also prolong the QT interval. Combining them raises the risk of serious ventricular arrhythmia, especially with electrolyte disturbances or other risk factors. The vandetanib label advises avoiding other QT-prolonging drugs.
What this interaction means in plain words
Quetiapine and Vandetanib 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.
Quetiapine belongs to Central Nervous System; Vandetanib belongs to Oncology.
Why it happens
Additive inhibition of cardiac repolarization (hERG potassium channel blockade).
What to do
Avoid the combination if possible and choose an antipsychotic with lower QT liability. If unavoidable, correct potassium, magnesium and calcium and monitor ECG regularly.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Quetiapine and Vandetanib, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
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 Quetiapine with Vandetanib?
MediHelp rates the interaction as major. Quetiapine and Vandetanib 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. Vandetanib causes marked, dose-related QT prolongation and torsades de pointes, and quetiapine can also prolong the QT interval. Combining them raises the risk of serious ventricular arrhythmia, especially with electrolyte disturbances or other risk factors. The vandetanib label advises avoiding other QT-prolonging drugs.
How serious is the interaction between Quetiapine and Vandetanib?
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 choose an antipsychotic with lower QT liability. If unavoidable, correct potassium, magnesium and calcium and monitor ECG regularly.
What other medicines interact with Quetiapine?
MediHelp also lists interactions of Quetiapine with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Quetiapine page.
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.
