Drug interactions
Lithium + Promazine
Severity: Major
Lithium 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
Combining lithium with a phenothiazine antipsychotic has been linked to neurotoxicity, including confusion, tremor, rigidity and in rare cases an encephalopathic syndrome. Extrapyramidal effects and neuroleptic malignant syndrome are also a concern.
What this interaction means in plain words
Lithium 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
Probably additive central dopaminergic and neuronal effects, with possible changes in intracellular lithium distribution; the mechanism is not fully established.
What to do
Use the lowest effective doses and monitor lithium levels and neurological status closely, especially when starting. Stop or reduce the drugs if there is confusion, fever, rigidity or severe tremor.
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 Lithium
- Lithium + Thioridazine Contraindicated
- Lithium + Vandetanib Contraindicated
- Aceclofenac + Lithium Major
- Acemetacin + Lithium Major
- Amisulpride + Lithium Major
- Amlodipine-benazepril + Lithium Major
Frequently asked questions
Can I take Lithium with Promazine?
MediHelp rates the interaction as major. Lithium 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. Combining lithium with a phenothiazine antipsychotic has been linked to neurotoxicity, including confusion, tremor, rigidity and in rare cases an encephalopathic syndrome. Extrapyramidal effects and neuroleptic malignant syndrome are also a concern.
How serious is the interaction between Lithium 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: Use the lowest effective doses and monitor lithium levels and neurological status closely, especially when starting. Stop or reduce the drugs if there is confusion, fever, rigidity or severe tremor.
What other medicines interact with Lithium?
MediHelp also lists interactions of Lithium with, for example, Thioridazine, Vandetanib, Aceclofenac. The full list is on the Lithium page.
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