Drug interactions
Foscarnet + Tropisetron
Severity: Moderate
Foscarnet and Tropisetron: moderate 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
Tropisetron, like other 5-HT3 antagonists, can prolong the QT interval, and foscarnet may also prolong QT and cause electrolyte loss. The combination may increase the risk of ventricular arrhythmias.
What this interaction means in plain words
Foscarnet and Tropisetron can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive QT interval prolongation with foscarnet-related electrolyte disturbances.
What to do
Monitor ECG in at-risk patients and correct potassium, magnesium and calcium. Consider a less QT-active antiemetic if risk factors are present.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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
Frequently asked questions
Can I take Foscarnet with Tropisetron?
MediHelp rates the interaction as moderate. Foscarnet and Tropisetron can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Tropisetron, like other 5-HT3 antagonists, can prolong the QT interval, and foscarnet may also prolong QT and cause electrolyte loss. The combination may increase the risk of ventricular arrhythmias.
How serious is the interaction between Foscarnet and Tropisetron?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor ECG in at-risk patients and correct potassium, magnesium and calcium. Consider a less QT-active antiemetic if risk factors are present.
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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