Drug interactions
Belladonna alkaloids + Fluphenazine
Severity: Moderate
Belladonna alkaloids 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
Fluphenazine has mild anticholinergic activity that may add to belladonna alkaloids, causing dry mouth, constipation, urinary retention, tachycardia and confusion. Anticholinergics may also reduce the antipsychotic effect or worsen tardive dyskinesia.
What this interaction means in plain words
Belladonna alkaloids 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
Additive antimuscarinic effects.
What to do
Monitor for anticholinergic toxicity, especially in older patients. Reduce the dose or choose an alternative if symptoms appear.
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 Belladonna alkaloids with Fluphenazine?
MediHelp rates the interaction as moderate. Belladonna alkaloids 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. Fluphenazine has mild anticholinergic activity that may add to belladonna alkaloids, causing dry mouth, constipation, urinary retention, tachycardia and confusion. Anticholinergics may also reduce the antipsychotic effect or worsen tardive dyskinesia.
How serious is the interaction between Belladonna alkaloids 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 for anticholinergic toxicity, especially in older patients. Reduce the dose or choose an alternative if symptoms appear.
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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