Drug interactions
Sevoflurane + Thioridazine
Severity: Major
Sevoflurane and Thioridazine: major 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
Sevoflurane can prolong the QT interval, and thioridazine strongly prolongs QTc. Perioperative use of both may precipitate torsades de pointes, especially with electrolyte disturbances or bradycardia. Thioridazine is a recognized concern for anesthetic management.
What this interaction means in plain words
Sevoflurane and Thioridazine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Sevoflurane belongs to Central Nervous System; Thioridazine belongs to Central Nervous System.
Why it happens
Additive prolongation of ventricular repolarization.
What to do
Inform the anesthesia team of thioridazine use, obtain a baseline ECG, and correct potassium and magnesium before surgery. Consider stopping thioridazine in advance when feasible, and monitor ECG intraoperatively.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Other interactions of Sevoflurane
Frequently asked questions
Can I take Sevoflurane with Thioridazine?
MediHelp rates the interaction as major. Sevoflurane and Thioridazine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Sevoflurane can prolong the QT interval, and thioridazine strongly prolongs QTc. Perioperative use of both may precipitate torsades de pointes, especially with electrolyte disturbances or bradycardia. Thioridazine is a recognized concern for anesthetic management.
How serious is the interaction between Sevoflurane and Thioridazine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Inform the anesthesia team of thioridazine use, obtain a baseline ECG, and correct potassium and magnesium before surgery. Consider stopping thioridazine in advance when feasible, and monitor ECG intraoperatively.
What other medicines interact with Thioridazine?
MediHelp also lists interactions of Thioridazine with, for example, Abiraterone, Adagrasib, Amiodarone. The full list is on the Thioridazine page.
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