Is Lactobacillus rhamnosus GG Safe with Vancomycin (Oral)?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Separate Lactobacillus rhamnosus GG from oral vancomycin by at least 2–3 hours. Given vancomycin is often used for C. difficile infection where this probiotic offers adjunctive benefit, timing of administration is critical. Continue probiotic for a minimum of 4 weeks after vancomycin completion to support microbiome restoration and reduce C. difficile recurrence risk.
Why this interaction occurs
Oral vancomycin, used primarily for C. difficile infection, achieves high intraluminal concentrations in the colon and has activity against gram-positive organisms including Lactobacillus species. Concurrent administration significantly reduces Lactobacillus viability and colonization efficiency. Dose separation is essential to preserve any probiotic benefit, particularly for reducing recurrent C. difficile infection rates as supported by clinical guideline recommendations.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 11,955,064 reports mentioning Vancomycin (Oral). This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Vancomycin (Oral) + 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 rhamnosus GG interactions → · All Vancomycin (Oral) interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.