Drug interactions
Orphenadrin + Trimipramine
Severity: Major
Orphenadrin and Trimipramine: 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
Trimipramine is strongly sedating and anticholinergic, which compounds orphenadrine's effects. The combination may cause marked drowsiness, confusion, urinary retention, constipation and tachycardia.
What this interaction means in plain words
Orphenadrin and Trimipramine 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.
Orphenadrin belongs to Musculoskeletal; Trimipramine belongs to Central Nervous System.
Why it happens
Additive CNS depression and muscarinic blockade.
What to do
Avoid the combination in older patients and those with cardiac disease, glaucoma or urinary retention. Otherwise use low doses and monitor for anticholinergic toxicity and sedation.
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
Other interactions of Trimipramine
- Disopyramide + Trimipramine Contraindicated
- Dofetilide + Trimipramine Contraindicated
- Ibutilide + Trimipramine Contraindicated
- Isocarboxazid + Trimipramine Contraindicated
- Pentamidine + Trimipramine Contraindicated
- Phenelzine + Trimipramine Contraindicated
Frequently asked questions
Can I take Orphenadrin with Trimipramine?
MediHelp rates the interaction as major. Orphenadrin and Trimipramine 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. Trimipramine is strongly sedating and anticholinergic, which compounds orphenadrine's effects. The combination may cause marked drowsiness, confusion, urinary retention, constipation and tachycardia.
How serious is the interaction between Orphenadrin and Trimipramine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination in older patients and those with cardiac disease, glaucoma or urinary retention. Otherwise use low doses and monitor for anticholinergic toxicity and sedation.
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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