Drug interactions
Foscarnet + Risperidone
Severity: Moderate
Foscarnet and Risperidone: 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
Risperidone can prolong the QT interval, and foscarnet may add to this and cause electrolyte disturbances. The combination increases arrhythmia risk, especially in patients with other risk factors.
What this interaction means in plain words
Foscarnet and Risperidone 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.
Foscarnet belongs to Anti Virals; Risperidone belongs to Central Nervous System.
Why it happens
Additive QT prolongation with electrolyte disturbance.
What to do
Monitor ECG and electrolytes, correcting deficits. Consider an alternative if QTc rises substantially.
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
Other interactions of Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Frequently asked questions
Can I take Foscarnet with Risperidone?
MediHelp rates the interaction as moderate. Foscarnet and Risperidone 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. Risperidone can prolong the QT interval, and foscarnet may add to this and cause electrolyte disturbances. The combination increases arrhythmia risk, especially in patients with other risk factors.
How serious is the interaction between Foscarnet and Risperidone?
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 and electrolytes, correcting deficits. Consider an alternative if QTc rises substantially.
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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