Drug interactions
Fluphenazine + Thiothixene
Severity: Moderate
Fluphenazine and Thiothixene: 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 the risk of extrapyramidal symptoms, sedation, orthostatic hypotension and neuroleptic malignant syndrome. Combined dopamine blockade also adds to QT prolongation risk.
What this interaction means in plain words
Fluphenazine and Thiothixene 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 D2 receptor antagonism and additive sedative, anticholinergic and alpha-adrenergic effects.
What to do
Avoid antipsychotic polypharmacy where possible and use the lowest effective doses. Monitor for movement disorders, sedation, hypotension and fever or rigidity.
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
Frequently asked questions
Can I take Fluphenazine with Thiothixene?
MediHelp rates the interaction as moderate. Fluphenazine and Thiothixene 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 the risk of extrapyramidal symptoms, sedation, orthostatic hypotension and neuroleptic malignant syndrome. Combined dopamine blockade also adds to QT prolongation risk.
How serious is the interaction between Fluphenazine and Thiothixene?
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 movement disorders, sedation, hypotension and fever or rigidity.
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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