Drug interactions
Chlorpromazine + Loxapine
Severity: Moderate
Chlorpromazine and Loxapine: 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
Two dopamine-blocking antipsychotics taken together raise the likelihood of extrapyramidal symptoms, sedation and neuroleptic malignant syndrome. Anticholinergic and hypotensive effects may also be additive.
What this interaction means in plain words
Chlorpromazine and Loxapine 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.
Chlorpromazine belongs to Central Nervous System; Loxapine belongs to Central Nervous System.
Why it happens
Additive dopamine D2 receptor antagonism with overlapping sedative, anticholinergic and alpha-blocking effects.
What to do
Avoid routine antipsychotic duplication where possible; if both are needed, use the lowest effective doses and monitor for rigidity, fever, movement disorders and sedation.
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 Chlorpromazine
- Chlorpromazine + Dofetilide Contraindicated
- Chlorpromazine + Dronedarone Contraindicated
- Chlorpromazine + Droperidol Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Chlorpromazine + Metrizamide Contraindicated
- Chlorpromazine + Panobinostat Contraindicated
Other interactions of Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Frequently asked questions
Can I take Chlorpromazine with Loxapine?
MediHelp rates the interaction as moderate. Chlorpromazine and Loxapine 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. Two dopamine-blocking antipsychotics taken together raise the likelihood of extrapyramidal symptoms, sedation and neuroleptic malignant syndrome. Anticholinergic and hypotensive effects may also be additive.
How serious is the interaction between Chlorpromazine and Loxapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid routine antipsychotic duplication where possible; if both are needed, use the lowest effective doses and monitor for rigidity, fever, movement disorders and sedation.
What other medicines interact with Chlorpromazine?
MediHelp also lists interactions of Chlorpromazine with, for example, Dofetilide, Dronedarone, Droperidol. The full list is on the Chlorpromazine page.
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