Drug interactions
Quetiapine + Zotepine
Severity: Major
Quetiapine 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 with D2 antagonism, so combining them raises the risk of extrapyramidal symptoms and neuroleptic malignant syndrome. Zotepine also lowers the seizure threshold and prolongs the QT interval, and sedation and hypotension add together.
What this interaction means in plain words
Quetiapine 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 D2, histamine H1 and alpha-1 receptor blockade, with additive QT and seizure-threshold effects.
What to do
Avoid concurrent use of the two antipsychotics where possible. If cross-titrating, monitor for movement disorders, sedation, blood pressure and QTc.
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 Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
Frequently asked questions
Can I take Quetiapine with Zotepine?
MediHelp rates the interaction as major. Quetiapine 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 with D2 antagonism, so combining them raises the risk of extrapyramidal symptoms and neuroleptic malignant syndrome. Zotepine also lowers the seizure threshold and prolongs the QT interval, and sedation and hypotension add together.
How serious is the interaction between Quetiapine 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 concurrent use of the two antipsychotics where possible. If cross-titrating, monitor for movement disorders, sedation, blood pressure and QTc.
What other medicines interact with Quetiapine?
MediHelp also lists interactions of Quetiapine with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Quetiapine page.
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