Drug interactions
Paliperidone + Promazine
Severity: Major
Paliperidone and Promazine: 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
Promazine is a phenothiazine antipsychotic that prolongs QT, and combining it with paliperidone duplicates antipsychotic therapy. This raises the risk of QT prolongation, sedation, hypotension and extrapyramidal effects.
What this interaction means in plain words
Paliperidone and Promazine 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 QT prolongation and dopamine D2 blockade with additive sedative and hypotensive effects.
What to do
Avoid concurrent use of two antipsychotics when possible. If necessary, monitor ECG and electrolytes and use the lowest doses.
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 Paliperidone
- Ibutilide + Paliperidone Contraindicated
- Paliperidone + Pimozide Contraindicated
- Paliperidone + Vandetanib Contraindicated
- Adagrasib + Paliperidone Major
- Amiodarone + Paliperidone Major
- Amisulpride + Paliperidone Major
Frequently asked questions
Can I take Paliperidone with Promazine?
MediHelp rates the interaction as major. Paliperidone and Promazine 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. Promazine is a phenothiazine antipsychotic that prolongs QT, and combining it with paliperidone duplicates antipsychotic therapy. This raises the risk of QT prolongation, sedation, hypotension and extrapyramidal effects.
How serious is the interaction between Paliperidone and Promazine?
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 two antipsychotics when possible. If necessary, monitor ECG and electrolytes and use the lowest doses.
What other medicines interact with Paliperidone?
MediHelp also lists interactions of Paliperidone with, for example, Ibutilide, Pimozide, Vandetanib. The full list is on the Paliperidone page.
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