Drug interactions
Fluticasone-salmeterol + Fosamprenavir
Severity: Contraindicated
Fluticasone-salmeterol and Fosamprenavir: contraindicated 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
Fosamprenavir (as amprenavir, usually ritonavir-boosted) inhibits CYP3A4 and can substantially increase salmeterol exposure. This raises the risk of QT prolongation, tachycardia and arrhythmia. Systemic fluticasone exposure also rises, risking adrenal suppression.
What this interaction means in plain words
Fluticasone-salmeterol and Fosamprenavir are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Why it happens
CYP3A4 inhibition reduces the metabolism of salmeterol and fluticasone.
What to do
Avoid concurrent use and switch to an alternative inhaled corticosteroid/LABA less reliant on CYP3A4, such as beclomethasone-based therapy. Monitor ECG and cortisol-related effects if it cannot be avoided.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Other interactions of Fluticasone-salmeterol
- Darunavir + Fluticasone-salmeterol Contraindicated
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Fluticasone-salmeterol Contraindicated
- Fluticasone-salmeterol + Indinavir Contraindicated
- Fluticasone-salmeterol + Lopinavir Contraindicated
- Fluticasone-salmeterol + Nelfinavir Contraindicated
- Fluticasone-salmeterol + Ritonavir Contraindicated
Frequently asked questions
Can I take Fluticasone-salmeterol with Fosamprenavir?
MediHelp rates the interaction as contraindicated. Fluticasone-salmeterol and Fosamprenavir are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Fosamprenavir (as amprenavir, usually ritonavir-boosted) inhibits CYP3A4 and can substantially increase salmeterol exposure. This raises the risk of QT prolongation, tachycardia and arrhythmia. Systemic fluticasone exposure also rises, risking adrenal suppression.
How serious is the interaction between Fluticasone-salmeterol and Fosamprenavir?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use and switch to an alternative inhaled corticosteroid/LABA less reliant on CYP3A4, such as beclomethasone-based therapy. Monitor ECG and cortisol-related effects if it cannot be avoided.
What other medicines interact with Fluticasone-salmeterol?
MediHelp also lists interactions of Fluticasone-salmeterol with, for example, Darunavir, Elvitegravir / cobicistat / emtricitabine / tenofovir df, Indinavir. The full list is on the Fluticasone-salmeterol page.
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