Drug interactions
Istradefylline + Rifaximin
Severity: Minor
Istradefylline and Rifaximin: 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
Istradefylline at higher doses inhibits P-glycoprotein and raised exposure of P-gp substrates. Rifaximin absorption may increase slightly, though baseline absorption is very low.
What this interaction means in plain words
Istradefylline and Rifaximin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Istradefylline belongs to Central Nervous System; Rifaximin belongs to Anti Bacterial.
Why it happens
P-glycoprotein inhibition reducing rifaximin efflux.
What to do
No routine adjustment is needed. Monitor for rifaximin adverse effects in patients with hepatic impairment.
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 Rifaximin
- Cholera vaccine + Rifaximin Major
- Microbiota + Rifaximin Major
- Amiodarone + Rifaximin Moderate
- Bcg intravesical live + Rifaximin Moderate
- Cyclosporin + Rifaximin Moderate
- Dronedarone + Rifaximin Moderate
Other interactions of Istradefylline
Frequently asked questions
Can I take Istradefylline with Rifaximin?
MediHelp rates the interaction as minor. Istradefylline and Rifaximin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Istradefylline at higher doses inhibits P-glycoprotein and raised exposure of P-gp substrates. Rifaximin absorption may increase slightly, though baseline absorption is very low.
How serious is the interaction between Istradefylline and Rifaximin?
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. Monitor for rifaximin adverse effects in patients with hepatic impairment.
What other medicines interact with Rifaximin?
MediHelp also lists interactions of Rifaximin with, for example, Cholera vaccine, Microbiota, Amiodarone. The full list is on the Rifaximin page.
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