Drug interactions
Quetiapine + Risperidone
Severity: Moderate
Quetiapine and Risperidone: 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 increases cumulative dopamine blockade, sedation, orthostatic hypotension and QT prolongation. Risks of extrapyramidal symptoms and neuroleptic malignant syndrome are also higher.
What this interaction means in plain words
Quetiapine and Risperidone 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.
Quetiapine belongs to Central Nervous System; Risperidone belongs to Central Nervous System.
Why it happens
Additive D2 antagonism, CNS depression, alpha-blockade and QT prolongation.
What to do
Avoid routine antipsychotic polypharmacy; if needed, use the lowest doses and monitor ECG, movement disorders, sedation and blood pressure.
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 Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
Other interactions of Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Frequently asked questions
Can I take Quetiapine with Risperidone?
MediHelp rates the interaction as moderate. Quetiapine and Risperidone 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 increases cumulative dopamine blockade, sedation, orthostatic hypotension and QT prolongation. Risks of extrapyramidal symptoms and neuroleptic malignant syndrome are also higher.
How serious is the interaction between Quetiapine and Risperidone?
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 polypharmacy; if needed, use the lowest doses and monitor ECG, movement disorders, sedation and blood pressure.
What other medicines interact with Quetiapine?
MediHelp also lists interactions of Quetiapine with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Quetiapine page.
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