Probiotics for Antibiotic Associated Diarrhea
Verdict: Published with Warning
Across 6 PubMed studies, the evidence for Probiotics in Antibiotic Associated Diarrhea grades Tier B — preliminary evidence. Effective, but with safety or population caveats.
B 🟡 B Preliminary Evidence Published with Warning
Why this grade7-layer evidence engine
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Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditableRaw score 0.67
D
C
B
A
S
← counter-evidence / ineffectiveeffective / strong evidence →
Final grade
B · Published with Warning
Confidence
75%
Broadly consistent
Evidence level
E1
Cochrane high-quality SR/MA
▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.67
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高品質 SR/MA 內部嚴重矛盾 (3 positive vs 2 negative，各 ≥2)
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 1 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status
PubMed studies (6)L2 · primary research & systematic reviews
Probiotics for the prevention of pediatric antibiotic-associated diarrhea
Finding: Across 33 RCTs (n=6352), AAD occurred in 8% (259/3232) of the probiotic group vs 19% (598/3120) of controls (RR 0.45, 95% CI 0.36-0.56; NNTB 9), with high-dose (>=5 billion CFU/day) more effective (RR 0.37, NNTB 6) and no serious adverse events attributable to probiotics.
View on PubMed Probiotics for the prevention of antibiotic-associated diarrhoea: a systematic review and meta-analysis
Finding: Pooling 42 RCTs (n=11,305), co-administration of probiotics reduced AAD risk in adults by 37% (RR 0.63, 95% CI 0.54-0.73, p<0.00001; GRADE moderate), with high dose more protective (RR 0.54) and benefit limited to moderate/high baseline-risk populations.
View on PubMed Systematic review with meta-analysis: Saccharomyces boulardii in the prevention of antibiotic-associated diarrhoea
Finding: Across 21 RCTs (n=4780), S. boulardii reduced AAD from 18.7% to 8.5% (RR 0.47, 95% CI 0.38-0.57, NNT 10), with consistent effects in children (RR 0.43) and adults (RR 0.49).
View on PubMed Probiotic use reduces the incidence of antibiotic-associated diarrhea among adult patients: a meta-analysis
Finding: Pooling 15 RCTs (n=7427, RoB-2 assessed, overall moderate quality), probiotics reduced AAD incidence by 40% (RR 0.60, 95% CI 0.43-0.82), with multistrain formulations markedly superior (RR 0.40) to dual- (RR 0.9) or single-strain (RR 0.6) products.
View on PubMed Probiotics for the Prevention of Antibiotic-Associated Diarrhea in Outpatients—A Systematic Review and Meta-Analysis
Finding: Across 17 RCTs (n=3631), AAD was 8.0% with probiotics vs 17.7% with control (RR 0.49, 95% CI 0.36-0.66; moderate quality), with similar effects for L. rhamnosus GG and S. boulardii and no significant excess of adverse events.
View on PubMed Early use of probiotics might prevent antibiotic-associated diarrhea in elderly (>65 years): a systematic review and meta-analysis
Finding: Across all 8 RCTs (n=4691) probiotics showed NO overall benefit in the elderly (RR 0.99, 95% CI 0.85-1.14, p=0.84); only the subgroup given probiotics within 2 days of antibiotics reached borderline significance (RR 0.71, p=0.05), so the positive conclusion rests on timing-subgroup, not the primary pooled estimate.
View on PubMed Regulatory & authoritative positionsL4/L5 · FDA / EMA / NIH ODS / Cochrane / Mayo …
L4a US FDA
Cautious
FDA has not approved any probiotic product for use as a drug or biological product in infants of any age source↗
L4b EU EFSA
Against
a cause and effect relationship had not been established between the consumption of a combination of bacterial strains and reduction of gastro-intestinal discomfort source↗
L4c UK NHS
Cautious
There's some evidence that probiotics may be helpful in some cases, such as helping to ease some symptoms of irritable bowel syndrome (IBS). But there's little evidence to support many health claims made about them. source↗
L4d TW TFDA / 衛福部
Supportive
益生菌屬食品，並無治療疾病的效果 source↗
L4e WHO
Neutral
probiotic supplementation with the strains Bifidobacterium longum subsp. Infantis DSM33361 and Lactobacillus rhamnosus GG source↗
L5a NIH Office of Dietary Supplements
Supportive
Probiotics might reduce some symptoms of IBS. source↗
L5b Mayo Clinic
Neutral
Some people take supplements called probiotics to restore the balance of healthy bacteria in their guts, and the research is mixed on whether probiotics ease symptoms of antibiotic-associated diarrhea. Taking probiotics probably won't do harm, but people with weakened immune systems should not use probiotic supplements. source↗
L5c Cleveland Clinic
Supportive
The thing that has really been shown to help the most with preventing diarrhea is taking probiotics when taking antibiotics. The most commonly studied for antibiotic-associated diarrhea are Lactobacillus rhamnosus-based and Saccharomyces boulardii-based probiotics. Probiotics could possibly be harmful for people with immune deficiencies or those who are severely debilitated. Be sure to ask your… source↗
L5d Harvard Health
Cautious
Those who took antibiotics plus probiotics were 42% less likely to develop diarrhea as those who got the placebo. Although the results of this study sound impressive, I won't be recommending probiotics every time I write a prescription for antibiotic. source↗
L5e Specialty Society (condition-mapped)
Against
We recommend against probiotics for the prevention of CDI in patients being treated with antibiotics (primary prevention) (conditional recommendation, moderate quality of evidence). We recommend against probiotics for the prevention of CDI recurrence (secondary prevention) (strong recommendation, very low quality of evidence). source↗