Drug interactions
Caffeine + Rifampin
Severity: Minor
Caffeine and Rifampin: 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
Rifampin can speed up caffeine clearance, lowering caffeine levels and shortening its effect. The change is usually of little clinical importance, though habitual caffeine users may notice a weaker effect.
What this interaction means in plain words
Caffeine and Rifampin 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
Rifampin induces hepatic CYP1A2, increasing caffeine metabolism.
What to do
No dose adjustment needed; counsel that caffeine effects may be reduced and that its effect returns after rifampin is stopped.
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 Caffeine
- Caffeine + Ephedrine Major
- Caffeine + Fezolinetant Major
- Caffeine + Methylenedioxymethamphetamine Major
- Caffeine + Selegiline transdermal Major
- Adenosine + Caffeine Moderate
- Benzphetamine + Caffeine Moderate
Frequently asked questions
Can I take Caffeine with Rifampin?
MediHelp rates the interaction as minor. Caffeine and Rifampin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Rifampin can speed up caffeine clearance, lowering caffeine levels and shortening its effect. The change is usually of little clinical importance, though habitual caffeine users may notice a weaker effect.
How serious is the interaction between Caffeine and Rifampin?
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 dose adjustment needed; counsel that caffeine effects may be reduced and that its effect returns after rifampin is stopped.
What other medicines interact with Caffeine?
MediHelp also lists interactions of Caffeine with, for example, Ephedrine, Fezolinetant, Methylenedioxymethamphetamine. The full list is on the Caffeine page.
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