Drug interactions
Fluphenazine + Iloperidone
Severity: Major
Fluphenazine and Iloperidone: 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
Combining two antipsychotics adds dopamine-blocking effects, raising the risk of extrapyramidal symptoms and neuroleptic malignant syndrome. Both drugs also prolong the QT interval and cause sedation and orthostatic hypotension, so arrhythmia risk is increased.
What this interaction means in plain words
Fluphenazine and Iloperidone 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.
Fluphenazine belongs to Central Nervous System; Iloperidone belongs to Central Nervous System.
Why it happens
Additive dopamine D2 antagonism, QT prolongation and sedative or alpha-blocking effects.
What to do
Avoid antipsychotic polypharmacy where possible. If used together, obtain a baseline and follow-up ECG, check electrolytes, and monitor for extrapyramidal symptoms, sedation and hypotension.
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 Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Other interactions of Iloperidone
- Iloperidone + Thioridazine Contraindicated
- Alfuzosin + Iloperidone Major
- Amiodarone + Iloperidone Major
- Amisulpride + Iloperidone Major
- Amitriptyline + Iloperidone Major
- Anagrelide + Iloperidone Major
Frequently asked questions
Can I take Fluphenazine with Iloperidone?
MediHelp rates the interaction as major. Fluphenazine and Iloperidone 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. Combining two antipsychotics adds dopamine-blocking effects, raising the risk of extrapyramidal symptoms and neuroleptic malignant syndrome. Both drugs also prolong the QT interval and cause sedation and orthostatic hypotension, so arrhythmia risk is increased.
How serious is the interaction between Fluphenazine and Iloperidone?
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 antipsychotic polypharmacy where possible. If used together, obtain a baseline and follow-up ECG, check electrolytes, and monitor for extrapyramidal symptoms, sedation and hypotension.
What other medicines interact with Fluphenazine?
MediHelp also lists interactions of Fluphenazine with, for example, Arsenic trioxide, Dofetilide, Ibutilide. The full list is on the Fluphenazine page.
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