Drug interactions
Butabarbital + Voriconazole
Severity: Contraindicated
Butabarbital and Voriconazole: 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
Butabarbital, a barbiturate, is expected to lower voriconazole levels, risking subtherapeutic antifungal exposure and treatment failure.
What this interaction means in plain words
Butabarbital and Voriconazole 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
Barbiturate-mediated induction of CYP2C19 and CYP3A4 enhances voriconazole metabolism.
What to do
Avoid combination; use a non-barbiturate sedative. If it cannot be avoided, monitor voriconazole trough concentrations and clinical response.
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 Voriconazole
- Avanafil + Voriconazole Contraindicated
- Carbamazepine + Voriconazole Contraindicated
- Conivaptan + Voriconazole Contraindicated
- Dihydroergotamine intranasal + Voriconazole Contraindicated
- Dihydroergotamine + Voriconazole Contraindicated
- Dofetilide + Voriconazole Contraindicated
Frequently asked questions
Can I take Butabarbital with Voriconazole?
MediHelp rates the interaction as contraindicated. Butabarbital and Voriconazole 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. Butabarbital, a barbiturate, is expected to lower voriconazole levels, risking subtherapeutic antifungal exposure and treatment failure.
How serious is the interaction between Butabarbital and Voriconazole?
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 combination; use a non-barbiturate sedative. If it cannot be avoided, monitor voriconazole trough concentrations and clinical response.
What other medicines interact with Voriconazole?
MediHelp also lists interactions of Voriconazole with, for example, Avanafil, Carbamazepine, Conivaptan. The full list is on the Voriconazole page.
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