Is Lactobacillus acidophilus Safe with Ciprofloxacin?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Take Lactobacillus at least 2 hours after ciprofloxacin dose. Continue probiotic supplementation for at least 2 weeks after completing the antibiotic course to restore gut flora.
Why this interaction occurs
Ciprofloxacin, a broad-spectrum fluoroquinolone, has bactericidal activity against Lactobacillus strains when taken concomitantly, rendering the probiotic ineffective. Separation of doses minimizes direct antibiotic-probiotic contact in the GI tract and allows colonization during antibiotic-free intervals.
Evidence
Evidence level: strong.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 86,830 reports mentioning Ciprofloxacin. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Ciprofloxacin + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Lactobacillus acidophilus interactions → · All Ciprofloxacin interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.