Drug interactions
Thioridazine + Zotepine
Severity: Major
Thioridazine and Zotepine: 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
Both are antipsychotics that block dopamine receptors and prolong the QT interval, and both cause sedation. Using them together raises the risk of extrapyramidal symptoms, neuroleptic malignant syndrome, arrhythmia and oversedation. Zotepine also lowers the seizure threshold.
What this interaction means in plain words
Thioridazine and Zotepine 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.
Why it happens
Additive dopamine antagonism, sedation and QTc prolongation.
What to do
Avoid combining two antipsychotics when possible, particularly with thioridazine. If used together, monitor the ECG, extrapyramidal signs and sedation.
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
Frequently asked questions
Can I take Thioridazine with Zotepine?
MediHelp rates the interaction as major. Thioridazine and Zotepine 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. Both are antipsychotics that block dopamine receptors and prolong the QT interval, and both cause sedation. Using them together raises the risk of extrapyramidal symptoms, neuroleptic malignant syndrome, arrhythmia and oversedation. Zotepine also lowers the seizure threshold.
How serious is the interaction between Thioridazine and Zotepine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining two antipsychotics when possible, particularly with thioridazine. If used together, monitor the ECG, extrapyramidal signs and sedation.
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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