Drug interactions
Lithium + Olanzapine
Severity: Moderate
Lithium and Olanzapine: 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
Lithium and olanzapine are often used together effectively, but rare neurotoxicity, extrapyramidal symptoms and neuroleptic malignant syndrome have been reported. Additive sedation, tremor and weight gain may also occur.
What this interaction means in plain words
Lithium and Olanzapine 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.
Lithium belongs to Central Nervous System; Olanzapine belongs to Central Nervous System.
Why it happens
Additive central dopaminergic and neurotoxic effects; the mechanism is not fully established.
What to do
Monitor lithium levels, neurological status and metabolic parameters. Stop the drugs if fever, rigidity or altered consciousness develops.
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 Olanzapine
Frequently asked questions
Can I take Lithium with Olanzapine?
MediHelp rates the interaction as moderate. Lithium and Olanzapine 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. Lithium and olanzapine are often used together effectively, but rare neurotoxicity, extrapyramidal symptoms and neuroleptic malignant syndrome have been reported. Additive sedation, tremor and weight gain may also occur.
How serious is the interaction between Lithium and Olanzapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor lithium levels, neurological status and metabolic parameters. Stop the drugs if fever, rigidity or altered consciousness develops.
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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