Probiotics in prevention of antibiotic associated diarrhoea: meta-analysis
Aloysius L D'Souza, research fellow,
Chakravarthi Rajkumar, senior lecturer and
honorary consultant, Jonathan Cooke,
statistician, Christopher J Bulpitt,
professor of geriatric medicine.
Care of the Elderly Section, Faculty of Medicine, Imperial College School of
Medicine, Hammersmith Hospital, London W12 0NN
Objective: To evaluate efficacy of probiotics in prevention
and treatment of diarrhoea associated with the use ofantibiotics.
Design: Meta-analysis; outcome data (proportion ofpatients
not getting diarrhoea) were analysed, pooled, and comparedto
determine odds ratios in treated and controlgroups. Identification: Studies identified by searching Medline between1966 and 2000 and the CochraneLibrary.
Studies reviewed Nine randomised, double blind, placebo controlled trials ofprobiotics. Results: Two of the nine studies investigated the effectsof
probiotics in children. Four trials used a yeast (Saccharomyces
boulardii), four used lactobacilli, and one used a strain of enterococcusthat produced lactic acid. Three trials used a combination of
probiotic strains of bacteria. In all nine trials, the probiotics
were given in combination with antibiotics and the control groups
received placebo and antibiotics. The odds ratio in favour ofactive
treatment over placebo in preventing diarrhoea associatedwith
antibiotics was 0.39 (95% confidence interval 0.25 to 0.62;P<0.001)
for the yeast and 0.34 (0.19 to 0.61; P<0.01 for lactobacilli.The
combined odds ratio was 0.37 (0.26 to 0.53; P<0.001) in favourof
active treatment overplacebo. Conclusions: The meta-analysis suggests that probioticscan be
used to prevent antibiotic associated diarrhoea and thatS
boulardii and lactobacilli have the potential to be used inthis
situation. The efficacy of probiotics in treating antibiotic
associated diarrhoea remains to be proved. A further large trialin
which probiotics are used as preventive agents should lookat the
costs of and need for routine use of theseagents.
What is already known on this topic
Probiotics are well known for their microbiological properties and have been
used to treat gastrointestinal and vaginal mucosal infections
Conflicting results have prevented probiotics from being accepted as
viable alternatives to conventional treatments for antibiotic associated
diarrhoea
The commercial availability of probiotics is increasing
What this study adds
Probiotics may prevent antibiotic associated diarrhoea
The potential of specific probiotics to prevent Clostridium difficile
infection secondary to the use of antibiotics should be re-examined
A large trial looking at the efficacy of probiotics in preventing
antibiotic associated diarrhoea, particularly in elderly patients, with an
emphasis on the optimal dose and cost benefits is needed
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