Drug interactions
Benzhydrocodone / acetaminophen + Orphenadrin
Severity: Major
Benzhydrocodone / acetaminophen and Orphenadrin: major 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
Orphenadrine is a sedating anticholinergic muscle relaxant, and benzhydrocodone is an opioid prodrug of hydrocodone. Combined use can cause profound sedation, respiratory depression, coma and death.
What this interaction means in plain words
Benzhydrocodone / acetaminophen and Orphenadrin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive CNS and respiratory depression, with anticholinergic effects layered on opioid effects.
What to do
Reserve the combination for patients without adequate alternatives, using the lowest doses and shortest duration. Monitor closely for sedation and respiratory depression.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Orphenadrin
Frequently asked questions
Can I take Benzhydrocodone / acetaminophen with Orphenadrin?
MediHelp rates the interaction as major. Benzhydrocodone / acetaminophen and Orphenadrin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Orphenadrine is a sedating anticholinergic muscle relaxant, and benzhydrocodone is an opioid prodrug of hydrocodone. Combined use can cause profound sedation, respiratory depression, coma and death.
How serious is the interaction between Benzhydrocodone / acetaminophen and Orphenadrin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Reserve the combination for patients without adequate alternatives, using the lowest doses and shortest duration. Monitor closely for sedation and respiratory depression.
What other medicines interact with Orphenadrin?
MediHelp also lists interactions of Orphenadrin with, for example, Alfentanil, Amobarbital, Brexanolone. The full list is on the Orphenadrin page.
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