Drug interactions
Diethylpropion + Fluphenazine
Severity: Moderate
Diethylpropion 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
Diethylpropion is a sympathomimetic stimulant that may oppose the sedative effect of fluphenazine and may exacerbate psychosis. The pharmacological opposition may reduce the effectiveness of both drugs, and the combination may promote arrhythmia in susceptible patients.
What this interaction means in plain words
Diethylpropion 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 opposition between dopamine blockade and sympathomimetic stimulation; evidence is limited.
What to do
Monitor psychiatric symptoms, heart rate and blood pressure. Avoid in patients with psychosis or significant cardiac disease.
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 Diethylpropion with Fluphenazine?
MediHelp rates the interaction as moderate. Diethylpropion 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. Diethylpropion is a sympathomimetic stimulant that may oppose the sedative effect of fluphenazine and may exacerbate psychosis. The pharmacological opposition may reduce the effectiveness of both drugs, and the combination may promote arrhythmia in susceptible patients.
How serious is the interaction between Diethylpropion 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 psychiatric symptoms, heart rate and blood pressure. Avoid in patients with psychosis or significant cardiac disease.
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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