Drug interactions
Quetiapine + Ziprasidone
Severity: Major
Quetiapine and Ziprasidone: 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 antipsychotics prolong the QT interval, and ziprasidone carries a notable risk of this effect. Combined use raises the likelihood of torsades de pointes and also adds to sedation and extrapyramidal effects.
What this interaction means in plain words
Quetiapine and Ziprasidone 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.
Quetiapine belongs to Central Nervous System; Ziprasidone belongs to Central Nervous System.
Why it happens
Additive QT prolongation, with additive dopamine D2 blockade and CNS depression.
What to do
Avoid the combination where possible, since antipsychotic polypharmacy rarely offers a clear benefit. If it is necessary, obtain a baseline and follow-up ECG and keep potassium and magnesium normal.
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
Other interactions of Ziprasidone
- Amiodarone + Ziprasidone Contraindicated
- Amitriptyline + Ziprasidone Contraindicated
- Arsenic trioxide + Ziprasidone Contraindicated
- Bedaquiline + Ziprasidone Contraindicated
- Chloroquine + Ziprasidone Contraindicated
- Citalopram + Ziprasidone Contraindicated
Frequently asked questions
Can I take Quetiapine with Ziprasidone?
MediHelp rates the interaction as major. Quetiapine and Ziprasidone 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 antipsychotics prolong the QT interval, and ziprasidone carries a notable risk of this effect. Combined use raises the likelihood of torsades de pointes and also adds to sedation and extrapyramidal effects.
How serious is the interaction between Quetiapine and Ziprasidone?
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 the combination where possible, since antipsychotic polypharmacy rarely offers a clear benefit. If it is necessary, obtain a baseline and follow-up ECG and keep potassium and magnesium normal.
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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