Drug interactions
Fluphenazine + Henbane
Severity: Moderate
Fluphenazine and Henbane: 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
Henbane contains antimuscarinic alkaloids such as hyoscyamine and scopolamine, which add to the anticholinergic burden of fluphenazine. This can cause confusion, tachycardia, urinary retention, constipation and hyperthermia, and the alkaloid content of herbal preparations is variable.
What this interaction means in plain words
Fluphenazine and Henbane 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 of belladonna-type alkaloids and fluphenazine.
What to do
Advise avoiding henbane products and monitor for anticholinergic toxicity if used. Choose a standardized alternative when an antimuscarinic is needed.
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 Henbane?
MediHelp rates the interaction as moderate. Fluphenazine and Henbane 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. Henbane contains antimuscarinic alkaloids such as hyoscyamine and scopolamine, which add to the anticholinergic burden of fluphenazine. This can cause confusion, tachycardia, urinary retention, constipation and hyperthermia, and the alkaloid content of herbal preparations is variable.
How serious is the interaction between Fluphenazine and Henbane?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise avoiding henbane products and monitor for anticholinergic toxicity if used. Choose a standardized alternative when an antimuscarinic is needed.
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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