Drug interactions
ciprofloxacin + levothyroxine
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.
Overview
Ciprofloxacin may reduce levothyroxine exposure, leading to elevated TSH and reduced thyroid hormone effect.
Mechanism of action
Unknown; suspected reduction of levothyroxine gastrointestinal absorption when coadministered.
Clinical management
Separate administration by at least 4–6 hours; monitor TSH (± free T4) during/after ciprofloxacin therapy; adjust levothyroxine dose if TSH deviates or symptoms arise.
Drug reference
References
- Levothyroxine—Drug Interactions (ciprofloxacin) — Lexicomp
- Interaction Report: ciprofloxacin + levothyroxine — Drugs.com
- Levothyroxine: Drug information (Interactions section) — UpToDate
Frequently asked questions
Can I take ciprofloxacin with levothyroxine?
The interaction is rated: Moderate. Ciprofloxacin may reduce levothyroxine exposure, leading to elevated TSH and reduced thyroid hormone effect.
How serious is the interaction between ciprofloxacin and levothyroxine?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between ciprofloxacin and levothyroxine managed?
Separate administration by at least 4–6 hours; monitor TSH (± free T4) during/after ciprofloxacin therapy; adjust levothyroxine dose if TSH deviates or symptoms arise.
Why do ciprofloxacin and levothyroxine interact?
Unknown; suspected reduction of levothyroxine gastrointestinal absorption when coadministered.
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