Drug interactions
Darifenacin + Trifluoperazine
Severity: Moderate
Darifenacin and Trifluoperazine: 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 agents have antimuscarinic activity, so together they can worsen dry mouth, constipation, urinary retention, blurred vision and confusion. Slowed gut motility may also alter absorption of oral trifluoperazine.
What this interaction means in plain words
Darifenacin and Trifluoperazine 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.
Why it happens
Additive antimuscarinic effects at cholinergic receptors.
What to do
Monitor for anticholinergic toxicity and cognitive effects, especially in older patients. Reduce dose or change therapy if symptoms occur.
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
Frequently asked questions
Can I take Darifenacin with Trifluoperazine?
MediHelp rates the interaction as moderate. Darifenacin and Trifluoperazine 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 agents have antimuscarinic activity, so together they can worsen dry mouth, constipation, urinary retention, blurred vision and confusion. Slowed gut motility may also alter absorption of oral trifluoperazine.
How serious is the interaction between Darifenacin and Trifluoperazine?
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 toxicity and cognitive effects, especially in older patients. Reduce dose or change therapy if symptoms occur.
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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