Drug interactions
Amoxapine + Risperidone
Severity: Major
Amoxapine and Risperidone: 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 has antidopaminergic and tricyclic properties, and both drugs can prolong QT, cause sedation and orthostatic hypotension. Together they raise the risk of arrhythmia, extrapyramidal effects and neuroleptic malignant syndrome. Risperidone may also raise amoxapine levels via CYP2D6 competition.
What this interaction means in plain words
Amoxapine and Risperidone 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
Additive D2 blockade, QT prolongation and CNS depression; possible CYP2D6 competition.
What to do
Avoid if possible; otherwise obtain a baseline ECG, correct electrolytes and monitor QTc and extrapyramidal signs. Use lower doses and monitor for sedation and hypotension.
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 Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Anagrelide + Risperidone Major
Frequently asked questions
Can I take Amoxapine with Risperidone?
MediHelp rates the interaction as major. Amoxapine and Risperidone 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 has antidopaminergic and tricyclic properties, and both drugs can prolong QT, cause sedation and orthostatic hypotension. Together they raise the risk of arrhythmia, extrapyramidal effects and neuroleptic malignant syndrome. Risperidone may also raise amoxapine levels via CYP2D6 competition.
How serious is the interaction between Amoxapine and Risperidone?
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 if possible; otherwise obtain a baseline ECG, correct electrolytes and monitor QTc and extrapyramidal signs. Use lower doses and monitor for sedation and hypotension.
What other medicines interact with Risperidone?
MediHelp also lists interactions of Risperidone with, for example, Ibutilide, Vandetanib, Adagrasib. The full list is on the Risperidone page.
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