Drug interactions
Loxapine inhaled + Perphenazine
Severity: Moderate
Loxapine inhaled and Perphenazine: 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
Loxapine is an antipsychotic, so combining it with perphenazine adds dopamine-blocking effects including extrapyramidal symptoms, sedation and neuroleptic malignant syndrome risk. Inhaled loxapine may also cause bronchospasm, and additive QT effects are possible.
What this interaction means in plain words
Loxapine inhaled and Perphenazine 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.
Why it happens
Additive dopamine D2 receptor antagonism and sedative effects.
What to do
Monitor for extrapyramidal symptoms, excessive sedation, and fever or rigidity suggesting neuroleptic malignant syndrome. Check an ECG if other QT-prolonging risks 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 Perphenazine
- Ibutilide + Perphenazine Contraindicated
- Perphenazine + Pimozide Contraindicated
- Perphenazine + Thioridazine Contraindicated
- Adagrasib + Perphenazine Major
- Alfentanil + Perphenazine Major
- Amiodarone + Perphenazine Major
Frequently asked questions
Can I take Loxapine inhaled with Perphenazine?
MediHelp rates the interaction as moderate. Loxapine inhaled and Perphenazine 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 is an antipsychotic, so combining it with perphenazine adds dopamine-blocking effects including extrapyramidal symptoms, sedation and neuroleptic malignant syndrome risk. Inhaled loxapine may also cause bronchospasm, and additive QT effects are possible.
How serious is the interaction between Loxapine inhaled and Perphenazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for extrapyramidal symptoms, excessive sedation, and fever or rigidity suggesting neuroleptic malignant syndrome. Check an ECG if other QT-prolonging risks exist.
What other medicines interact with Perphenazine?
MediHelp also lists interactions of Perphenazine with, for example, Ibutilide, Pimozide, Thioridazine. The full list is on the Perphenazine page.
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