Drug interactions
Loxapine + Quetiapine
Severity: Moderate
Loxapine and Quetiapine: 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
Combining two antipsychotics increases dopamine blockade and sedation and adds to risk of orthostatic hypotension, QT prolongation, and neuroleptic malignant syndrome. Benefits of dual therapy are poorly established.
What this interaction means in plain words
Loxapine and Quetiapine 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.
Loxapine belongs to Central Nervous System; Quetiapine belongs to Central Nervous System.
Why it happens
Additive D2 antagonism, with additive sedative, alpha-1 blocking and QT effects.
What to do
Avoid antipsychotic polypharmacy where possible and use the lowest effective doses. Monitor sedation, blood pressure, extrapyramidal signs, and QTc if risk factors exist.
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 Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Other interactions of Quetiapine
- Adagrasib + Quetiapine Major
- Amiodarone + Quetiapine Major
- Amisulpride + Quetiapine Major
- Amoxapine + Quetiapine Major
- Anagrelide + Quetiapine Major
- Apalutamide + Quetiapine Major
Frequently asked questions
Can I take Loxapine with Quetiapine?
MediHelp rates the interaction as moderate. Loxapine and Quetiapine 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. Combining two antipsychotics increases dopamine blockade and sedation and adds to risk of orthostatic hypotension, QT prolongation, and neuroleptic malignant syndrome. Benefits of dual therapy are poorly established.
How serious is the interaction between Loxapine and Quetiapine?
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 where possible and use the lowest effective doses. Monitor sedation, blood pressure, extrapyramidal signs, and QTc if risk factors exist.
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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