Drug interactions
Venlafaxine + Ziprasidone
Severity: Major
Venlafaxine 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 drugs can prolong the QT interval, and ziprasidone is known for a clear QT effect, so combining them raises the risk of torsades de pointes. Additive serotonergic and dopaminergic effects also make serotonin syndrome or neuroleptic malignant syndrome possible, though uncommon.
What this interaction means in plain words
Venlafaxine 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.
Venlafaxine belongs to Central Nervous System; Ziprasidone belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic QT prolongation plus overlapping serotonergic and dopamine-blocking effects.
What to do
Obtain a baseline ECG and electrolytes, and monitor the QTc after starting or raising either dose. Consider an alternative with less QT effect in patients with cardiac risk factors, and watch for signs of serotonin toxicity.
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 Venlafaxine
- Isocarboxazid + Venlafaxine Contraindicated
- Methylene blue + Venlafaxine Contraindicated
- Phenelzine + Venlafaxine Contraindicated
- Procarbazine + Venlafaxine Contraindicated
- Rasagiline + Venlafaxine Contraindicated
- Safinamide + Venlafaxine Contraindicated
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 Venlafaxine with Ziprasidone?
MediHelp rates the interaction as major. Venlafaxine 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 drugs can prolong the QT interval, and ziprasidone is known for a clear QT effect, so combining them raises the risk of torsades de pointes. Additive serotonergic and dopaminergic effects also make serotonin syndrome or neuroleptic malignant syndrome possible, though uncommon.
How serious is the interaction between Venlafaxine 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: Obtain a baseline ECG and electrolytes, and monitor the QTc after starting or raising either dose. Consider an alternative with less QT effect in patients with cardiac risk factors, and watch for signs of serotonin toxicity.
What other medicines interact with Venlafaxine?
MediHelp also lists interactions of Venlafaxine with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Venlafaxine page.
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