Drug interactions
Darifenacin + Grapefruit
Severity: Minor
Darifenacin and Grapefruit: minor 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
Grapefruit juice may modestly increase darifenacin exposure. Higher levels can increase antimuscarinic adverse effects.
What this interaction means in plain words
Darifenacin and Grapefruit have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Grapefruit components inhibit intestinal CYP3A4, reducing first-pass metabolism of darifenacin.
What to do
Counsel patients to limit grapefruit intake and watch for dry mouth, constipation or blurred vision. No dose change is usually needed.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Darifenacin
Frequently asked questions
Can I take Darifenacin with Grapefruit?
MediHelp rates the interaction as minor. Darifenacin and Grapefruit have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Grapefruit juice may modestly increase darifenacin exposure. Higher levels can increase antimuscarinic adverse effects.
How serious is the interaction between Darifenacin and Grapefruit?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Counsel patients to limit grapefruit intake and watch for dry mouth, constipation or blurred vision. No dose change is usually needed.
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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