Drug interactions
Haloperidol + Loxapine
Severity: Moderate
Haloperidol 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
Using two antipsychotics together adds dopamine blockade, increasing the risk of extrapyramidal symptoms, sedation, and rarely neuroleptic malignant syndrome. Both agents may also contribute to QT prolongation.
What this interaction means in plain words
Haloperidol 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.
Haloperidol belongs to Central Nervous System; Loxapine belongs to Central Nervous System.
Why it happens
Additive dopamine D2 receptor antagonism and sedative effects.
What to do
Avoid antipsychotic polypharmacy unless clearly needed, and use the lowest effective doses. Monitor for extrapyramidal symptoms, hyperthermia, rigidity 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 Haloperidol
- Dofetilide + Haloperidol Contraindicated
- Dronedarone + Haloperidol Contraindicated
- Haloperidol + Ibutilide Contraindicated
- Haloperidol + Levoketoconazole Contraindicated
- Haloperidol + Panobinostat Contraindicated
- Haloperidol + Pimozide 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 Haloperidol with Loxapine?
MediHelp rates the interaction as moderate. Haloperidol 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. Using two antipsychotics together adds dopamine blockade, increasing the risk of extrapyramidal symptoms, sedation, and rarely neuroleptic malignant syndrome. Both agents may also contribute to QT prolongation.
How serious is the interaction between Haloperidol 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 antipsychotic polypharmacy unless clearly needed, and use the lowest effective doses. Monitor for extrapyramidal symptoms, hyperthermia, rigidity and sedation.
What other medicines interact with Haloperidol?
MediHelp also lists interactions of Haloperidol with, for example, Dofetilide, Dronedarone, Ibutilide. The full list is on the Haloperidol page.
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