Drug interactions
Benzphetamine + Fluphenazine
Severity: Moderate
Benzphetamine 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
Benzphetamine is a sympathomimetic anorectic and fluphenazine is a dopamine antagonist, so their effects partly oppose each other. Stimulant effects may also add to cardiovascular strain such as tachycardia and raised blood pressure.
What this interaction means in plain words
Benzphetamine 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
Opposing dopaminergic and sympathomimetic pharmacodynamic effects; the mechanism is not well established.
What to do
Monitor heart rate, blood pressure and psychiatric status. Consider an alternative weight-management strategy in patients with psychosis.
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 Benzphetamine with Fluphenazine?
MediHelp rates the interaction as moderate. Benzphetamine 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. Benzphetamine is a sympathomimetic anorectic and fluphenazine is a dopamine antagonist, so their effects partly oppose each other. Stimulant effects may also add to cardiovascular strain such as tachycardia and raised blood pressure.
How serious is the interaction between Benzphetamine 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 heart rate, blood pressure and psychiatric status. Consider an alternative weight-management strategy in patients with psychosis.
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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