Drug interactions
Foscarnet + Vandetanib
Severity: Contraindicated
Foscarnet 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 carries a boxed warning for QT prolongation, torsades de pointes and sudden death. Foscarnet adds QT liability and may cause electrolyte disturbances, making the combination particularly hazardous.
What this interaction means in plain words
Foscarnet 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.
Foscarnet belongs to Anti Virals; Vandetanib belongs to Oncology.
Why it happens
Additive QT prolongation, with foscarnet-induced hypocalcemia, hypomagnesemia or hypokalemia further increasing risk.
What to do
Avoid the combination; choose an alternative antiviral or defer vandetanib while foscarnet is needed. If unavoidable, monitor ECG and electrolytes very frequently and correct abnormalities immediately.
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 Foscarnet
- Cidofovir + Foscarnet Contraindicated
- Foscarnet + Pimozide Contraindicated
- Foscarnet + Thioridazine Contraindicated
- Adagrasib + Foscarnet Major
- Adefovir + Foscarnet Major
- Alfuzosin + Foscarnet 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 Foscarnet with Vandetanib?
MediHelp rates the interaction as contraindicated. Foscarnet 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 carries a boxed warning for QT prolongation, torsades de pointes and sudden death. Foscarnet adds QT liability and may cause electrolyte disturbances, making the combination particularly hazardous.
How serious is the interaction between Foscarnet 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; choose an alternative antiviral or defer vandetanib while foscarnet is needed. If unavoidable, monitor ECG and electrolytes very frequently and correct abnormalities immediately.
What other medicines interact with Foscarnet?
MediHelp also lists interactions of Foscarnet with, for example, Cidofovir, Pimozide, Thioridazine. The full list is on the Foscarnet page.
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