Drug interactions
Fluphenazine + Orphenadrin
Severity: Moderate
Fluphenazine and Orphenadrin: 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 is a phenothiazine with sedative and anticholinergic effects, and orphenadrine is often used to treat its extrapyramidal effects. Combined use can add to drowsiness and anticholinergic burden, including confusion, constipation and urinary retention, and may worsen tardive dyskinesia or psychosis.
What this interaction means in plain words
Fluphenazine and Orphenadrin 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 belongs to Central Nervous System; Orphenadrin belongs to Musculoskeletal.
Why it happens
Additive CNS depression and antimuscarinic effects.
What to do
Use the lowest effective orphenadrine dose and review the need regularly. Monitor for sedation, anticholinergic effects and cognitive changes.
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 Orphenadrin
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 Orphenadrin?
MediHelp rates the interaction as moderate. Fluphenazine and Orphenadrin 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 is a phenothiazine with sedative and anticholinergic effects, and orphenadrine is often used to treat its extrapyramidal effects. Combined use can add to drowsiness and anticholinergic burden, including confusion, constipation and urinary retention, and may worsen tardive dyskinesia or psychosis.
How serious is the interaction between Fluphenazine and Orphenadrin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective orphenadrine dose and review the need regularly. Monitor for sedation, anticholinergic effects and cognitive changes.
What other medicines interact with Orphenadrin?
MediHelp also lists interactions of Orphenadrin with, for example, Alfentanil, Amobarbital, Benzhydrocodone / acetaminophen. The full list is on the Orphenadrin page.
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