Drug interactions
Orphenadrin + Trifluoperazine
Severity: Moderate
Orphenadrin and Trifluoperazine: 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
Both agents have antimuscarinic activity and cause sedation, so combined use can intensify anticholinergic effects and drowsiness. Confusion, urinary retention, constipation and tachycardia may occur, particularly in older patients.
What this interaction means in plain words
Orphenadrin and Trifluoperazine 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 CNS depression and additive antimuscarinic effects.
What to do
Monitor for oversedation and anticholinergic toxicity, and lower the dose of either drug if symptoms develop. Orphenadrine is sometimes used deliberately to treat antipsychotic extrapyramidal effects, so review its ongoing need.
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
Frequently asked questions
Can I take Orphenadrin with Trifluoperazine?
MediHelp rates the interaction as moderate. Orphenadrin and Trifluoperazine 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. Both agents have antimuscarinic activity and cause sedation, so combined use can intensify anticholinergic effects and drowsiness. Confusion, urinary retention, constipation and tachycardia may occur, particularly in older patients.
How serious is the interaction between Orphenadrin and Trifluoperazine?
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 oversedation and anticholinergic toxicity, and lower the dose of either drug if symptoms develop. Orphenadrine is sometimes used deliberately to treat antipsychotic extrapyramidal effects, so review its ongoing need.
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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