Drug interactions
Budesonide-formoterol + Fostemsavir
Severity: Moderate
Budesonide-formoterol and Fostemsavir: 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
Fostemsavir has caused QT prolongation at supratherapeutic doses, and formoterol can also prolong QT. Combined use may add to arrhythmia risk, mainly in patients with other risk factors.
What this interaction means in plain words
Budesonide-formoterol and Fostemsavir 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.
Budesonide-formoterol belongs to Respiratory; Fostemsavir belongs to Anti Virals.
Why it happens
Additive QT prolongation.
What to do
Use recommended fostemsavir doses and consider ECG monitoring in patients with cardiac risk factors. Correct hypokalemia and hypomagnesemia.
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 Budesonide-formoterol
Other interactions of Fostemsavir
- Apalutamide + Fostemsavir Contraindicated
- Carbamazepine + Fostemsavir Contraindicated
- Enzalutamide + Fostemsavir Contraindicated
- Fostemsavir + Mitotane Contraindicated
- Fostemsavir + Phenytoin Contraindicated
- Fostemsavir + Rifampicin Contraindicated
Frequently asked questions
Can I take Budesonide-formoterol with Fostemsavir?
MediHelp rates the interaction as moderate. Budesonide-formoterol and Fostemsavir 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. Fostemsavir has caused QT prolongation at supratherapeutic doses, and formoterol can also prolong QT. Combined use may add to arrhythmia risk, mainly in patients with other risk factors.
How serious is the interaction between Budesonide-formoterol and Fostemsavir?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use recommended fostemsavir doses and consider ECG monitoring in patients with cardiac risk factors. Correct hypokalemia and hypomagnesemia.
What other medicines interact with Budesonide-formoterol?
MediHelp also lists interactions of Budesonide-formoterol with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Budesonide-formoterol page.
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