NutriStack
Lactobacillus Rhamnosus and Metronidazole, a synergy.
Lactobacillus rhamnosus GG reduces antibiotic-associated diarrhea during metronidazole therapy and helps restore gut microbiome balance disrupted by broad anaerobic coverage. Separation from the antibiotic dose preserves bacterial viability.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Lactobacillus Rhamnosus and Metronidazole
- Pair type
- Synergy
- Evidence (highest tier)
- Strong
- Source citations
- 2 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Strong evidence
Synergy
What is happening. Lactobacillus rhamnosus GG reduces antibiotic-associated diarrhea during metronidazole therapy and helps restore gut microbiome balance disrupted by broad anaerobic coverage. Separation from the antibiotic dose preserves bacterial viability.
Mechanism. L. rhamnosus restores colonization resistance and competes with opportunistic pathogens; it also produces antimicrobial peptides and short-chain fatty acids that suppress C. difficile overgrowth.
Recommendation. Take Lactobacillus rhamnosus throughout your metronidazole course, separated by at least 2 hours from each antibiotic dose. Continue for at least 1 week after the antibiotic ends.
Minimum separation. 120
Sources (2)
- Barnes D, Yeh AM. Bugs and Guts: Practical Applications of Probiotics for Gastrointestinal Disorders in Children. Nutr Clin Pract. 2015;30(6):747-59. PMID 26538058
- Doar NW, Samuthiram SD. Qualitative Analysis of the Efficacy of Probiotic Strains in the Prevention of Antibiotic-Associated Diarrhea. Cureus. 2023;15(6):e40261. PMID 37440799
Stack Score
How this pair moves the number.
Effect on the composite score
If both Lactobacillus Rhamnosus and Metronidazole are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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