Drug interactions
Darifenacin + Loxapine
Severity: Moderate
Darifenacin and Loxapine: 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
Loxapine has anticholinergic properties, so adding darifenacin increases the risk of dry mouth, constipation, urinary retention, confusion and impaired sweating. Antagonism of the bladder effect is also possible.
What this interaction means in plain words
Darifenacin and Loxapine 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; Loxapine belongs to Central Nervous System.
Why it happens
Additive antimuscarinic pharmacodynamic effects.
What to do
Monitor for anticholinergic toxicity, especially in older patients. Consider an alternative bladder agent without anticholinergic activity.
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 Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Frequently asked questions
Can I take Darifenacin with Loxapine?
MediHelp rates the interaction as moderate. Darifenacin and Loxapine 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. Loxapine has anticholinergic properties, so adding darifenacin increases the risk of dry mouth, constipation, urinary retention, confusion and impaired sweating. Antagonism of the bladder effect is also possible.
How serious is the interaction between Darifenacin and Loxapine?
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, especially in older patients. Consider an alternative bladder agent without anticholinergic activity.
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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