Drug interactions
Donepezil transdermal + Fluphenazine
Severity: Moderate
Donepezil transdermal and Fluphenazine: 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
Donepezil increases cholinergic tone, while fluphenazine blocks dopamine and has anticholinergic activity, so each may reduce the benefit of the other. Cholinesterase inhibitors may also worsen extrapyramidal symptoms in patients taking antipsychotics.
What this interaction means in plain words
Donepezil transdermal and Fluphenazine 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
Pharmacodynamic antagonism between cholinesterase inhibition and dopamine blockade/anticholinergic activity.
What to do
Monitor cognitive response and extrapyramidal symptoms such as tremor and rigidity. Reassess the need for the antipsychotic if movement symptoms emerge.
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 Donepezil transdermal with Fluphenazine?
MediHelp rates the interaction as moderate. Donepezil transdermal and Fluphenazine 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. Donepezil increases cholinergic tone, while fluphenazine blocks dopamine and has anticholinergic activity, so each may reduce the benefit of the other. Cholinesterase inhibitors may also worsen extrapyramidal symptoms in patients taking antipsychotics.
How serious is the interaction between Donepezil transdermal and Fluphenazine?
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 cognitive response and extrapyramidal symptoms such as tremor and rigidity. Reassess the need for the antipsychotic if movement symptoms emerge.
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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