Drug interactions
Fennel + Moxifloxacin
Severity: Minor
Fennel and Moxifloxacin: 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
Fennel preparations may contain minerals and plant constituents that could reduce how much oral moxifloxacin is absorbed. Lower antibiotic exposure could lead to reduced efficacy. The interaction is poorly characterised.
What this interaction means in plain words
Fennel and Moxifloxacin 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
Possible binding of moxifloxacin to polyvalent cations or plant components in the gut lowering absorption; not firmly established.
What to do
Take oral moxifloxacin at least 2 hours before or 6 hours after fennel supplements. Advise patients to avoid concentrated fennel products during the antibiotic course.
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 Moxifloxacin
- Amiodarone + Moxifloxacin Contraindicated
- Arsenic trioxide + Moxifloxacin Contraindicated
- Disopyramide + Moxifloxacin Contraindicated
- Dofetilide + Moxifloxacin Contraindicated
- Dronedarone + Moxifloxacin Contraindicated
- Droperidol + Moxifloxacin Contraindicated
Frequently asked questions
Can I take Fennel with Moxifloxacin?
MediHelp rates the interaction as minor. Fennel and Moxifloxacin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Fennel preparations may contain minerals and plant constituents that could reduce how much oral moxifloxacin is absorbed. Lower antibiotic exposure could lead to reduced efficacy. The interaction is poorly characterised.
How serious is the interaction between Fennel and Moxifloxacin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Take oral moxifloxacin at least 2 hours before or 6 hours after fennel supplements. Advise patients to avoid concentrated fennel products during the antibiotic course.
What other medicines interact with Moxifloxacin?
MediHelp also lists interactions of Moxifloxacin with, for example, Amiodarone, Arsenic trioxide, Disopyramide. The full list is on the Moxifloxacin page.
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