Drug interactions
Formoterol-mometasone + Foscarnet
Severity: Moderate
Formoterol-mometasone and Foscarnet: 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
Foscarnet can prolong the QT interval and commonly causes electrolyte disturbances such as low potassium, magnesium and calcium. Formoterol adds QT and hypokalemic effects, increasing arrhythmia risk.
What this interaction means in plain words
Formoterol-mometasone and Foscarnet 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.
Formoterol-mometasone belongs to Respiratory; Foscarnet belongs to Anti Virals.
Why it happens
Additive QT prolongation with foscarnet-induced electrolyte depletion and beta2-agonist-induced hypokalemia.
What to do
Monitor potassium, magnesium and calcium and correct deficits. Obtain an ECG in patients with cardiac risk factors.
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 Formoterol-mometasone
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 Formoterol-mometasone with Foscarnet?
MediHelp rates the interaction as moderate. Formoterol-mometasone and Foscarnet 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 can prolong the QT interval and commonly causes electrolyte disturbances such as low potassium, magnesium and calcium. Formoterol adds QT and hypokalemic effects, increasing arrhythmia risk.
How serious is the interaction between Formoterol-mometasone and Foscarnet?
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 potassium, magnesium and calcium and correct deficits. Obtain an ECG in patients with cardiac risk factors.
What other medicines interact with Formoterol-mometasone?
MediHelp also lists interactions of Formoterol-mometasone with, for example, Amiodarone, Amisulpride, Amoxapine. The full list is on the Formoterol-mometasone page.
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