Drug interactions
Fluphenazine + Loxapine
Severity: Moderate
Fluphenazine and Loxapine: 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 dopamine-blocking antipsychotics increases the risk of extrapyramidal symptoms, tardive dyskinesia and, rarely, neuroleptic malignant syndrome. Sedation and anticholinergic effects may also be additive.
What this interaction means in plain words
Fluphenazine and Loxapine 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.
Fluphenazine belongs to Central Nervous System; Loxapine belongs to Central Nervous System.
Why it happens
Additive dopamine D2 receptor antagonism with overlapping sedative and anticholinergic pharmacodynamic effects.
What to do
Avoid antipsychotic polypharmacy where possible and use the lowest effective doses. Monitor for rigidity, tremor, akathisia, hyperthermia and excess sedation.
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 Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Other interactions of Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Frequently asked questions
Can I take Fluphenazine with Loxapine?
MediHelp rates the interaction as moderate. Fluphenazine and Loxapine 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 dopamine-blocking antipsychotics increases the risk of extrapyramidal symptoms, tardive dyskinesia and, rarely, neuroleptic malignant syndrome. Sedation and anticholinergic effects may also be additive.
How serious is the interaction between Fluphenazine and Loxapine?
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 for rigidity, tremor, akathisia, hyperthermia and excess sedation.
What other medicines interact with Fluphenazine?
MediHelp also lists interactions of Fluphenazine with, for example, Arsenic trioxide, Dofetilide, Ibutilide. The full list is on the Fluphenazine page.
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