Fosamprenavir and Voriconazole interaction
Fosamprenavir and Voriconazole: both prescribing labels describe an interaction that usually calls for monitoring, a dose change, or spacing the doses.
Usually manageable with monitoring or a dose change. Tell your pharmacist you take both.
What the FDA labels say
From the Voriconazole label · effective 2026-06-02
Frequent monitoring for adverse reactions and toxicity related to voriconazole for concomitant administration with other HIV protease inhibitors.
In Vitro Studies Demonstrated Potential for Voriconazole to Inhibit Metabolism (Increased Plasma Exposure) Frequent monitoring for adverse reactions and toxicity related to other HIV protease inhibitors.
Other HIV Protease Inhibitors (CYP3A4 Inhibition) In Vivo Studies Showed No Significant Effects of Indinavir on Voriconazole Exposure In Vitro Studies Demonstrated Potential for Inhibition of Voriconazole Metabolism (Increased Plasma Exposure) No dosage adjustment in the voriconazole dosage needed for concomitant administration with indinavir.
Prednisolone and other corticosteroids (CYP3A4 Inhibition) In Vivo Studies Showed No Significant Effects of voriconazole on Prednisolone Exposure Not Studied In Vitro or In Vivo for Other Corticosteroids, but Drug Exposure Likely to be Increased No dosage adjustment for prednisolone when concomitantly administered with voriconazole [see Clinical Pharmacology…
Other HIV Protease Inhibitors (CYP3A4 Inhibition) In Vivo Studies Showed No Significant Effects on Indinavir Exposure No dosage adjustment for indinavir when concomitantly administered with voriconazole.
From the Fosamprenavir (Fosamprenavir Calcium) label · effective 2026-06-30
Antifungals: Ketoconazole a , itraconazole ↑ Ketoconazole ↑ Itraconazole Increase monitoring for adverse events.
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.