Drug interactions
Darifenacin + Orphenadrin
Severity: Moderate
Darifenacin 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 block muscarinic receptors. Taken together they can increase dry mouth, constipation, urinary retention, blurred vision and cognitive effects, especially in older patients.
What this interaction means in plain words
Darifenacin 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.
Darifenacin belongs to Genitourinary; Orphenadrin belongs to Musculoskeletal.
Why it happens
Additive antimuscarinic effects.
What to do
Monitor for anticholinergic adverse effects, including urinary retention and constipation, and consider stopping or replacing one agent if they emerge. Avoid in patients with narrow-angle glaucoma or cognitive impairment.
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 Darifenacin
Frequently asked questions
Can I take Darifenacin with Orphenadrin?
MediHelp rates the interaction as moderate. Darifenacin 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 block muscarinic receptors. Taken together they can increase dry mouth, constipation, urinary retention, blurred vision and cognitive effects, especially in older patients.
How serious is the interaction between Darifenacin 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: Monitor for anticholinergic adverse effects, including urinary retention and constipation, and consider stopping or replacing one agent if they emerge. Avoid in patients with narrow-angle glaucoma or cognitive impairment.
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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