Fluticasone and Fosamprenavir interaction
Fluticasone and Fosamprenavir: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Fluticasone (FLUTICASONE PROPIONATE DISKUS) label · effective 2026-05-14
Strong cytochrome P450 3A4 inhibitors (e.g., ritonavir, ketoconazole): Use not recommended.
Drug Interactions with Strong Cytochrome P450 3A4 Inhibitors The use of strong cytochrome P450 3A4 (CYP3A4) inhibitors (e.g., ritonavir, atazanavir, clarithromycin, indinavir, itraconazole, nefazodone, nelfinavir, saquinavir, ketoconazole, telithromycin) with Fluticasone Propionate DISKUS is not recommended because increased systemic corticosteroid adverse effects…
The use of strong CYP3A4 inhibitors (e.g., ritonavir, atazanavir, clarithromycin, indinavir, itraconazole, nefazodone, nelfinavir, saquinavir, ketoconazole, telithromycin) with Fluticasone Propionate DISKUS is not recommended because increased systemic corticosteroid adverse effects may occur.
Ritonavir A drug interaction trial with fluticasone propionate aqueous nasal spray in healthy subjects has shown that ritonavir (a strong CYP3A4 inhibitor) can significantly increase plasma fluticasone propionate exposure, resulting in significantly reduced serum cortisol concentrations [see Clinical Pharmacology ( 12.3 )] .
Inhibitors of Cytochrome P450 3A4 Fluticasone propionate is a substrate of CYP3A4.
From the Fosamprenavir (Fosamprenavir Calcium) label · effective 2026-06-30
Coadministration of fluticasone and fosamprenavir calcium/ritonavir is not recommended unless the potential benefit to the patient outweighs the risk of systemic corticosteroid side effects.
Inhaled/nasal steroid: Fluticasone Fosamprenavir calcium: ↑ Fluticasone Use with caution.
Consider alternatives to fluticasone, particularly for long-term use.
Fosamprenavir calcium/ritonavir: ↑ Fluticasone May result in significantly reduced serum cortisol concentrations.
Corticosteroid: Dexamethasone ↓ Amprenavir Use with caution.
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.