Drug interactions
Foscarnet + Quetiapine
Severity: Major
Foscarnet and Quetiapine: 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
Quetiapine can prolong the QT interval, particularly in overdose or with other risk factors, and foscarnet adds QT effects and electrolyte loss. The combination may increase the risk of arrhythmia.
What this interaction means in plain words
Foscarnet and Quetiapine 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.
Foscarnet belongs to Anti Virals; Quetiapine belongs to Central Nervous System.
Why it happens
Additive QT prolongation with foscarnet-induced electrolyte disturbance.
What to do
Monitor ECG and electrolytes and correct deficits. Consider an alternative antipsychotic with lower QT liability if QTc increases.
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 Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
Frequently asked questions
Can I take Foscarnet with Quetiapine?
MediHelp rates the interaction as major. Foscarnet and Quetiapine 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 can prolong the QT interval, particularly in overdose or with other risk factors, and foscarnet adds QT effects and electrolyte loss. The combination may increase the risk of arrhythmia.
How serious is the interaction between Foscarnet and Quetiapine?
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 and correct deficits. Consider an alternative antipsychotic with lower QT liability if QTc increases.
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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