Drug interactions
Thioridazine + Thiothixene
Severity: Moderate
Thioridazine and Thiothixene: moderate 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
Using two antipsychotics together increases dopamine blockade, raising the risk of extrapyramidal symptoms, sedation and neuroleptic malignant syndrome. Thioridazine also prolongs QT, and thiothixene may add modestly to this.
What this interaction means in plain words
Thioridazine and Thiothixene can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Additive dopamine D2 receptor antagonism and additive sedative and QT-prolonging effects.
What to do
Avoid antipsychotic polypharmacy where possible; if used, monitor for extrapyramidal symptoms, sedation, fever or rigidity, and check ECG.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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 Thiothixene?
MediHelp rates the interaction as moderate. Thioridazine and Thiothixene can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Using two antipsychotics together increases dopamine blockade, raising the risk of extrapyramidal symptoms, sedation and neuroleptic malignant syndrome. Thioridazine also prolongs QT, and thiothixene may add modestly to this.
How serious is the interaction between Thioridazine and Thiothixene?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid antipsychotic polypharmacy where possible; if used, monitor for extrapyramidal symptoms, sedation, fever or rigidity, and check ECG.
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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