Drug interactions
Loxapine + Pimozide
Severity: Major
Loxapine and Pimozide: major interaction.
Last updated Sources: US FDA label
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
Both are potent dopamine antagonists, and combining them increases the risk of extrapyramidal symptoms, sedation, and neuroleptic malignant syndrome. Pimozide also prolongs the QT interval, and adding another antipsychotic may raise the risk of torsades de pointes.
What this interaction means in plain words
Loxapine and Pimozide 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.
Loxapine belongs to Central Nervous System; Pimozide belongs to Central Nervous System.
Why it happens
Additive dopamine D2 blockade and additive QT prolongation.
What to do
Avoid combined use where possible. If unavoidable, obtain a baseline ECG, correct potassium and magnesium, and monitor QTc and neurological signs.
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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References
Other interactions of Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Other interactions of Pimozide
- Adagrasib + Pimozide Contraindicated
- Amiodarone + Pimozide Contraindicated
- Amisulpride + Pimozide Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amoxapine + Pimozide Contraindicated
- Anagrelide + Pimozide Contraindicated
Frequently asked questions
Can I take Loxapine with Pimozide?
MediHelp rates the interaction as major. Loxapine and Pimozide 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. Both are potent dopamine antagonists, and combining them increases the risk of extrapyramidal symptoms, sedation, and neuroleptic malignant syndrome. Pimozide also prolongs the QT interval, and adding another antipsychotic may raise the risk of torsades de pointes.
How serious is the interaction between Loxapine and Pimozide?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combined use where possible. If unavoidable, obtain a baseline ECG, correct potassium and magnesium, and monitor QTc and neurological signs.
What other medicines interact with Loxapine?
MediHelp also lists interactions of Loxapine with, for example, Alfentanil, Alprazolam, Amisulpride. The full list is on the Loxapine page.
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