Drug interactions
Erythromycin + Vandetanib
Severity: Contraindicated
Erythromycin and Vandetanib: contraindicated interaction.
Last updated Sources: EMA 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
Vandetanib causes substantial, dose-related QT prolongation and erythromycin also prolongs the QT interval. Combined use increases the risk of torsades de pointes and sudden death.
What this interaction means in plain words
Erythromycin 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.
Erythromycin belongs to Anti Bacterial; Vandetanib belongs to Oncology.
Why it happens
Additive prolongation of cardiac repolarization (QTc).
What to do
Avoid the combination and use a non-QT-prolonging antibiotic. If unavoidable, monitor ECG and electrolytes frequently.
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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References
Other interactions of Erythromycin
- Conivaptan + Erythromycin Contraindicated
- Dihydroergotamine intranasal + Erythromycin Contraindicated
- Dihydroergotamine + Erythromycin Contraindicated
- Domperidone + Erythromycin Contraindicated
- Dronedarone + Erythromycin Contraindicated
- Droperidol + Erythromycin 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 Erythromycin with Vandetanib?
MediHelp rates the interaction as contraindicated. Erythromycin 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 substantial, dose-related QT prolongation and erythromycin also prolongs the QT interval. Combined use increases the risk of torsades de pointes and sudden death.
How serious is the interaction between Erythromycin 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 the combination and use a non-QT-prolonging antibiotic. If unavoidable, monitor ECG and electrolytes frequently.
What other medicines interact with Erythromycin?
MediHelp also lists interactions of Erythromycin with, for example, Conivaptan, Dihydroergotamine intranasal, Dihydroergotamine. The full list is on the Erythromycin page.
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