Drug interactions
Clozapine + Trifluoperazine
Severity: Moderate
Clozapine and Trifluoperazine: 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
Combining two antipsychotics increases sedation, extrapyramidal symptoms, anticholinergic effects and the risk of neuroleptic malignant syndrome. Trifluoperazine may also add to QT effects and clozapine's metabolic burden.
What this interaction means in plain words
Clozapine and Trifluoperazine 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 blockade and sedative, anticholinergic and hypotensive effects.
What to do
Use antipsychotic combinations only with a clear indication, and monitor for movement disorders, sedation, fever, rigidity and ECG changes.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Clozapine and Trifluoperazine, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Clozapine
- Clozapine + Deferiprone Contraindicated
- Clozapine + Irinotecan Contraindicated
- Clozapine + Pimozide Contraindicated
- Clozapine + Thioridazine Contraindicated
- Acalabrutinib + Clozapine Major
- Adagrasib + Clozapine Major
Frequently asked questions
Can I take Clozapine with Trifluoperazine?
MediHelp rates the interaction as moderate. Clozapine and Trifluoperazine 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. Combining two antipsychotics increases sedation, extrapyramidal symptoms, anticholinergic effects and the risk of neuroleptic malignant syndrome. Trifluoperazine may also add to QT effects and clozapine's metabolic burden.
How serious is the interaction between Clozapine and Trifluoperazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use antipsychotic combinations only with a clear indication, and monitor for movement disorders, sedation, fever, rigidity and ECG changes.
What other medicines interact with Clozapine?
MediHelp also lists interactions of Clozapine with, for example, Deferiprone, Irinotecan, Pimozide. The full list is on the Clozapine page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
