Drug interactions
Haloperidol + Orphenadrin
Severity: Moderate
Haloperidol 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
Both drugs can cause sedation, and orphenadrine adds anticholinergic effects that may cause confusion, urinary retention and constipation. Orphenadrine may be used to treat haloperidol-induced parkinsonism, but it may worsen cognitive impairment and tardive dyskinesia.
What this interaction means in plain words
Haloperidol 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.
Haloperidol 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 reassess the need periodically. Monitor for sedation, anticholinergic toxicity and mental status 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 Haloperidol
- Dofetilide + Haloperidol Contraindicated
- Dronedarone + Haloperidol Contraindicated
- Haloperidol + Ibutilide Contraindicated
- Haloperidol + Levoketoconazole Contraindicated
- Haloperidol + Panobinostat Contraindicated
- Haloperidol + Pimozide Contraindicated
Frequently asked questions
Can I take Haloperidol with Orphenadrin?
MediHelp rates the interaction as moderate. Haloperidol 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. Both drugs can cause sedation, and orphenadrine adds anticholinergic effects that may cause confusion, urinary retention and constipation. Orphenadrine may be used to treat haloperidol-induced parkinsonism, but it may worsen cognitive impairment and tardive dyskinesia.
How serious is the interaction between Haloperidol 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 reassess the need periodically. Monitor for sedation, anticholinergic toxicity and mental status 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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