Drug interactions
Thioridazine + Voriconazole
Severity: Contraindicated
Thioridazine 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
Both drugs prolong the QT interval, and voriconazole may increase thioridazine exposure by inhibiting its metabolism. Thioridazine carries a high risk of torsades de pointes and sudden death.
What this interaction means in plain words
Thioridazine 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.
Thioridazine belongs to Central Nervous System; Voriconazole belongs to Anti Fungals.
Why it happens
Additive QT prolongation combined with voriconazole inhibition of CYP-mediated thioridazine metabolism.
What to do
Avoid the combination. Use an antipsychotic with a lower QT liability, or an alternative antifungal.
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
- Butabarbital + Voriconazole Contraindicated
- Carbamazepine + Voriconazole Contraindicated
- Conivaptan + Voriconazole Contraindicated
- Dihydroergotamine intranasal + Voriconazole Contraindicated
- Dihydroergotamine + Voriconazole Contraindicated
Other interactions of Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Frequently asked questions
Can I take Thioridazine with Voriconazole?
MediHelp rates the interaction as contraindicated. Thioridazine 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. Both drugs prolong the QT interval, and voriconazole may increase thioridazine exposure by inhibiting its metabolism. Thioridazine carries a high risk of torsades de pointes and sudden death.
How serious is the interaction between Thioridazine 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 the combination. Use an antipsychotic with a lower QT liability, or an alternative antifungal.
What other medicines interact with Voriconazole?
MediHelp also lists interactions of Voriconazole with, for example, Avanafil, Butabarbital, Carbamazepine. The full list is on the Voriconazole page.
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