Drug interactions
Cariprazine + Thioridazine
Severity: Major
Cariprazine and Thioridazine: major interaction.
Last updated Sources: UK SmPC
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 with sedative and dopamine-blocking activity. Using them together increases the risk of sedation, orthostatic hypotension, extrapyramidal symptoms and neuroleptic malignant syndrome. Thioridazine also carries a prominent QT prolongation risk that adds to the overall cardiac burden of dual antipsychotic therapy.
What this interaction means in plain words
Cariprazine 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.
Cariprazine belongs to Central Nervous System; Thioridazine belongs to Central Nervous System.
Why it happens
Additive dopamine D2 antagonism and CNS depression, with thioridazine-related QT prolongation.
What to do
Avoid combining two antipsychotics when possible. If unavoidable, obtain a baseline and follow-up ECG with electrolytes and monitor for movement disorders 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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References
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 Cariprazine
Frequently asked questions
Can I take Cariprazine with Thioridazine?
MediHelp rates the interaction as major. Cariprazine 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. Both are antipsychotics with sedative and dopamine-blocking activity. Using them together increases the risk of sedation, orthostatic hypotension, extrapyramidal symptoms and neuroleptic malignant syndrome. Thioridazine also carries a prominent QT prolongation risk that adds to the overall cardiac burden of dual antipsychotic therapy.
How serious is the interaction between Cariprazine 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: Avoid combining two antipsychotics when possible. If unavoidable, obtain a baseline and follow-up ECG with electrolytes and monitor for movement disorders 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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