Drug interactions
Crizotinib + Foscarnet
Severity: Major
Crizotinib and Foscarnet: 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
Both agents can prolong the QT interval, and foscarnet-related electrolyte abnormalities increase the risk further. The combination may predispose to serious ventricular arrhythmias.
What this interaction means in plain words
Crizotinib and Foscarnet 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.
Crizotinib belongs to Oncology; Foscarnet belongs to Anti Virals.
Why it happens
Additive QT prolongation, aggravated by foscarnet-induced electrolyte disturbances.
What to do
Monitor ECG and electrolytes at baseline and periodically, correcting abnormalities. Interrupt or reduce crizotinib 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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Other interactions of Foscarnet
- Cidofovir + Foscarnet Contraindicated
- Foscarnet + Pimozide Contraindicated
- Foscarnet + Thioridazine Contraindicated
- Foscarnet + Vandetanib Contraindicated
- Adagrasib + Foscarnet Major
- Adefovir + Foscarnet Major
Other interactions of Crizotinib
- Crizotinib + Flibanserin Contraindicated
- Crizotinib + Lomitapide Contraindicated
- Crizotinib + Lonafarnib Contraindicated
- Crizotinib + Pimozide Contraindicated
- Crizotinib + Saquinavir Contraindicated
- Crizotinib + Thioridazine Contraindicated
Frequently asked questions
Can I take Crizotinib with Foscarnet?
MediHelp rates the interaction as major. Crizotinib and Foscarnet 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. Both agents can prolong the QT interval, and foscarnet-related electrolyte abnormalities increase the risk further. The combination may predispose to serious ventricular arrhythmias.
How serious is the interaction between Crizotinib and Foscarnet?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor ECG and electrolytes at baseline and periodically, correcting abnormalities. Interrupt or reduce crizotinib if QTc becomes markedly prolonged.
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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