Drug interactions
Oxybutynin + Rifabutin
Severity: Minor
Oxybutynin and Rifabutin: 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
Rifabutin induces CYP3A4 and may lower oxybutynin concentrations, potentially reducing bladder symptom control. The effect is likely modest since rifabutin is a weaker inducer than rifampicin.
What this interaction means in plain words
Oxybutynin and Rifabutin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Oxybutynin belongs to Genitourinary; Rifabutin belongs to Anti Bacterial.
Why it happens
Induction of CYP3A4-mediated oxybutynin metabolism.
What to do
Monitor symptom control and increase oxybutynin dose only if response is inadequate.
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 Oxybutynin
Other interactions of Rifabutin
- Cabotegravir + Rifabutin Contraindicated
- Lorlatinib + Rifabutin Contraindicated
- Rifabutin + Voriconazole Contraindicated
- Apixaban + Rifabutin Major
- Axitinib + Rifabutin Major
- Brexpiprazole + Rifabutin Major
Frequently asked questions
Can I take Oxybutynin with Rifabutin?
MediHelp rates the interaction as minor. Oxybutynin and Rifabutin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Rifabutin induces CYP3A4 and may lower oxybutynin concentrations, potentially reducing bladder symptom control. The effect is likely modest since rifabutin is a weaker inducer than rifampicin.
How serious is the interaction between Oxybutynin and Rifabutin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor symptom control and increase oxybutynin dose only if response is inadequate.
What other medicines interact with Oxybutynin?
MediHelp also lists interactions of Oxybutynin with, for example, Bethanechol, Clozapine, Potassium chloride. The full list is on the Oxybutynin page.
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