Drug interactions
Darifenacin + Dimenhydrinate
Severity: Moderate
Darifenacin and Dimenhydrinate: 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
Dimenhydrinate is a first-generation antihistamine with marked anticholinergic activity, and darifenacin is an antimuscarinic. Taken together they can add to dry mouth, constipation, urinary retention, blurred vision, confusion and drowsiness, especially in older adults.
What this interaction means in plain words
Darifenacin and Dimenhydrinate 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; Dimenhydrinate belongs to Respiratory.
Why it happens
Additive antimuscarinic (anticholinergic) pharmacodynamic effects.
What to do
Avoid the combination in elderly or cognitively impaired patients where possible, or use the lowest effective doses. Monitor for constipation, urinary retention, confusion and sedation.
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 Darifenacin
Other interactions of Dimenhydrinate
Frequently asked questions
Can I take Darifenacin with Dimenhydrinate?
MediHelp rates the interaction as moderate. Darifenacin and Dimenhydrinate 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. Dimenhydrinate is a first-generation antihistamine with marked anticholinergic activity, and darifenacin is an antimuscarinic. Taken together they can add to dry mouth, constipation, urinary retention, blurred vision, confusion and drowsiness, especially in older adults.
How serious is the interaction between Darifenacin and Dimenhydrinate?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination in elderly or cognitively impaired patients where possible, or use the lowest effective doses. Monitor for constipation, urinary retention, confusion and sedation.
What other medicines interact with Darifenacin?
MediHelp also lists interactions of Darifenacin with, for example, Atazanavir, Bethanechol, Clarithromycin. The full list is on the Darifenacin page.
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