Drug interactions
Isavuconazole + Rifampicin
Severity: Contraindicated
Isavuconazole and Rifampicin: 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
Rifampicin greatly lowers isavuconazole concentrations, risking failure of antifungal therapy in serious invasive mycoses.
What this interaction means in plain words
Isavuconazole and Rifampicin 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.
Isavuconazole belongs to Anti Fungals; Rifampicin belongs to Anti Bacterial.
Why it happens
Rifampicin induces CYP3A4/5 and other enzymes, accelerating isavuconazole metabolism.
What to do
Do not co-administer; use rifabutin cautiously or an alternative antifungal or antimycobacterial regimen.
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 Isavuconazole
- Carbamazepine + Isavuconazole Contraindicated
- Efavirenz + Isavuconazole Contraindicated
- Etravirine + Isavuconazole Contraindicated
- Isavuconazole + Ketoconazole Contraindicated
- Isavuconazole + Phenobarbitone Contraindicated
- Isavuconazole + Phenytoin Contraindicated
Other interactions of Rifampicin
- Cabotegravir + Rifampicin Contraindicated
- Delamanid + Rifampicin Contraindicated
- Doravirine + Rifampicin Contraindicated
- Ensitrelvir + Rifampicin Contraindicated
- Fostemsavir + Rifampicin Contraindicated
- Isavuconazonium + Rifampicin Contraindicated
Frequently asked questions
Can I take Isavuconazole with Rifampicin?
MediHelp rates the interaction as contraindicated. Isavuconazole and Rifampicin 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. Rifampicin greatly lowers isavuconazole concentrations, risking failure of antifungal therapy in serious invasive mycoses.
How serious is the interaction between Isavuconazole and Rifampicin?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not co-administer; use rifabutin cautiously or an alternative antifungal or antimycobacterial regimen.
What other medicines interact with Isavuconazole?
MediHelp also lists interactions of Isavuconazole with, for example, Carbamazepine, Efavirenz, Etravirine. The full list is on the Isavuconazole page.
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