Drug interactions
Fluphenazine + Lithium
Severity: Moderate
Fluphenazine and Lithium: moderate 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 high-potency phenothiazine can lead to neurotoxicity, including confusion, tremor, extrapyramidal signs and rarely encephalopathy, even with lithium levels in the therapeutic range. There is also an added risk of neuroleptic malignant syndrome.
What this interaction means in plain words
Fluphenazine and Lithium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Fluphenazine belongs to Central Nervous System; Lithium belongs to Central Nervous System.
Why it happens
Additive central dopaminergic blockade and neurotoxic effects, with the mechanism not fully established.
What to do
Use the lowest effective doses and monitor serum lithium levels and neurological status. Stop both drugs and give supportive care if fever, rigidity or marked mental status change appears.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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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
Other interactions of Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Frequently asked questions
Can I take Fluphenazine with Lithium?
MediHelp rates the interaction as moderate. Fluphenazine and Lithium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Combining lithium with a high-potency phenothiazine can lead to neurotoxicity, including confusion, tremor, extrapyramidal signs and rarely encephalopathy, even with lithium levels in the therapeutic range. There is also an added risk of neuroleptic malignant syndrome.
How serious is the interaction between Fluphenazine and Lithium?
MediHelp rates it moderate, 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 serum lithium levels and neurological status. Stop both drugs and give supportive care if fever, rigidity or marked mental status change appears.
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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