Table 1. Probiotics studied in trials and patients with absence of diarrhoea at end of trial Trial Probiotic Dose Duration of treatment Antibiotic studied % of patients without diarrhoea Active group Placebo group Adam et al3 S boulardii 4 capsules/day Variable Mixture 96 83 Gotz et al4 L acidophilus and L bulgaricus 1 sachet Lactinex four times a day 5 days Ampicillin 100 86 Surawicz et al5 S boulardii 1 g/day Variable Mixture 91 78 Wunderlich et al6 E faecium SF68 1 capsule twice a day 7 days Mixture 91 73 Tankanow et al7 L acidophilus and L bulgaricus 1 g Lactinex four times a day 10 days Amoxicillin 34 31 Orrhage et al8 L acidophilus and Bifidobacterium longum Fermented milk with cultures 250 ml twice a day 21 days Clindamycin 80 30 McFarland et al9 S boulardii 1 g/day 49 days Mixture 93 85 Lewis et al10 S boulardii 113 mg twice a day 14 days Mixture 79 83 Vanderhoof et al11 Lactobacillus GG 1-2 capsules a day (1010 colonies per capsule) 10 days Mixture 93 74