Drug interactions
Darifenacin + Isoniazid
Severity: Minor
Darifenacin and Isoniazid: 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
Isoniazid inhibits CYP3A4 to a limited degree and may raise darifenacin concentrations, mildly increasing antimuscarinic adverse effects. The clinical significance is likely small.
What this interaction means in plain words
Darifenacin and Isoniazid have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Darifenacin belongs to Genitourinary; Isoniazid belongs to Anti Bacterial.
Why it happens
Weak inhibition of CYP3A4 by isoniazid decreases darifenacin metabolism.
What to do
No routine adjustment is needed; watch for anticholinergic adverse effects such as dry mouth and constipation.
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
Other interactions of Isoniazid
Frequently asked questions
Can I take Darifenacin with Isoniazid?
MediHelp rates the interaction as minor. Darifenacin and Isoniazid have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Isoniazid inhibits CYP3A4 to a limited degree and may raise darifenacin concentrations, mildly increasing antimuscarinic adverse effects. The clinical significance is likely small.
How serious is the interaction between Darifenacin and Isoniazid?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine adjustment is needed; watch for anticholinergic adverse effects such as dry mouth and constipation.
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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