Drug interactions
Rifampin + Tetracycline
Severity: Minor
Rifampin and Tetracycline: 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 is a strong enzyme inducer and may lower tetracycline exposure. Tetracycline is mainly eliminated unchanged, so the effect is modest and less established than for doxycycline, but reduced antibacterial effect is possible.
What this interaction means in plain words
Rifampin and Tetracycline 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 induction of metabolic enzymes and possibly transporters may increase tetracycline clearance; tetracycline is not a major CYP3A4 substrate.
What to do
Monitor clinical response to tetracycline when given with rifampin and consider alternative therapy if treatment fails.
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 Tetracycline
- Acitretin + Tetracycline Contraindicated
- Methoxyflurane + Tetracycline Contraindicated
- Isotretinoin + Tetracycline Major
- Palovarotene + Tetracycline Major
- Strontium ranelate + Tetracycline Major
- Tetracycline + Tretinoin Major
Frequently asked questions
Can I take Rifampin with Tetracycline?
MediHelp rates the interaction as minor. Rifampin and Tetracycline 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 is a strong enzyme inducer and may lower tetracycline exposure. Tetracycline is mainly eliminated unchanged, so the effect is modest and less established than for doxycycline, but reduced antibacterial effect is possible.
How serious is the interaction between Rifampin and Tetracycline?
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 clinical response to tetracycline when given with rifampin and consider alternative therapy if treatment fails.
What other medicines interact with Tetracycline?
MediHelp also lists interactions of Tetracycline with, for example, Acitretin, Methoxyflurane, Isotretinoin. The full list is on the Tetracycline page.
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