Drug interactions
Olanzapine + Ziprasidone
Severity: Major
Olanzapine 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
Ziprasidone carries a clear QT-prolonging liability and olanzapine adds a smaller effect. Combining two antipsychotics also increases overall adverse effect burden such as sedation and metabolic effects, with no proven added benefit.
What this interaction means in plain words
Olanzapine 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.
Olanzapine belongs to Central Nervous System; Ziprasidone belongs to Central Nervous System.
Why it happens
Additive QT prolongation through cardiac potassium channel blockade, plus overlapping antipsychotic pharmacodynamic effects.
What to do
Avoid combining where possible and prefer antipsychotic monotherapy. If combined, obtain a baseline and follow-up ECG and correct electrolyte disturbances.
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 Olanzapine
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 Olanzapine with Ziprasidone?
MediHelp rates the interaction as major. Olanzapine 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. Ziprasidone carries a clear QT-prolonging liability and olanzapine adds a smaller effect. Combining two antipsychotics also increases overall adverse effect burden such as sedation and metabolic effects, with no proven added benefit.
How serious is the interaction between Olanzapine 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 combining where possible and prefer antipsychotic monotherapy. If combined, obtain a baseline and follow-up ECG and correct electrolyte disturbances.
What other medicines interact with Olanzapine?
MediHelp also lists interactions of Olanzapine with, for example, Amisulpride, Amoxapine, Apomorphine. The full list is on the Olanzapine page.
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