Drug interactions
Loxapine + Thioridazine
Severity: Major
Loxapine and Thioridazine: major interaction.
Last updated Sources: EMA 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 drugs are antipsychotics that block dopamine receptors and cause sedation and hypotension. Together they increase the risk of extrapyramidal symptoms, neuroleptic malignant syndrome and QT prolongation. Dual antipsychotic therapy with thioridazine adds cardiac risk without clear benefit.
What this interaction means in plain words
Loxapine 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.
Loxapine belongs to Central Nervous System; Thioridazine belongs to Central Nervous System.
Why it happens
Additive dopamine D2 antagonism, CNS depression and QT prolongation.
What to do
Avoid using both agents together when possible. If needed, monitor ECG and electrolytes and watch for rigidity, fever and movement disorders.
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 Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Frequently asked questions
Can I take Loxapine with Thioridazine?
MediHelp rates the interaction as major. Loxapine 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 drugs are antipsychotics that block dopamine receptors and cause sedation and hypotension. Together they increase the risk of extrapyramidal symptoms, neuroleptic malignant syndrome and QT prolongation. Dual antipsychotic therapy with thioridazine adds cardiac risk without clear benefit.
How serious is the interaction between Loxapine 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 using both agents together when possible. If needed, monitor ECG and electrolytes and watch for rigidity, fever and movement disorders.
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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