Drug interactions
Amoxapine + Loxapine
Severity: Major
Amoxapine and Loxapine: major 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
Amoxapine is a metabolite of loxapine and has dopamine-blocking activity, so combining them duplicates therapy. This raises the risk of extrapyramidal symptoms, tardive dyskinesia, neuroleptic malignant syndrome, sedation, anticholinergic effects and seizures.
What this interaction means in plain words
Amoxapine and Loxapine 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.
Why it happens
Duplicated dopamine D2 antagonism along with additive sedative, anticholinergic and seizure-threshold-lowering effects.
What to do
Avoid using the two together, as they are pharmacologically related. If unavoidable, use the lowest doses and monitor for movement disorders, sedation and signs of neuroleptic malignant syndrome.
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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Other interactions of Loxapine
Frequently asked questions
Can I take Amoxapine with Loxapine?
MediHelp rates the interaction as major. Amoxapine and Loxapine 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. Amoxapine is a metabolite of loxapine and has dopamine-blocking activity, so combining them duplicates therapy. This raises the risk of extrapyramidal symptoms, tardive dyskinesia, neuroleptic malignant syndrome, sedation, anticholinergic effects and seizures.
How serious is the interaction between Amoxapine and Loxapine?
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 using the two together, as they are pharmacologically related. If unavoidable, use the lowest doses and monitor for movement disorders, sedation and signs of neuroleptic malignant syndrome.
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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