Antibiotic-associated diarrhea (AAD) occurs when antibiotics disturb the natural balance of "good" and "bad" bacteria in the intestinal tract causing harmful bacteria to multiply beyond their normal numbers. The symptoms of AAD include frequent watery bowel movements and crampy abdominal pain. Probiotics are found in dietary supplements or yogurts and contain potentially beneficial bacteria or yeast. Probiotics may restore the natural balance of bacteria in the intestinal tract. Sixteen studies were reviewed and provide the best available evidence. The studies tested 3432 children (2 weeks to 17 years of age) who were receiving probiotics co-administered with antibiotics to prevent AAD. The participants received probiotics (Lactobacilli spp., Bifidobacterium spp., Streptococcus spp., or Saccharomyces boulardii alone or in combination), placebo (pills not including probiotics), other treatments thought to prevent AAD (i.e. diosmectite or infant formula) or no treatment. The studies were short-term, ranging in length from 10 days to 3 months. Analyses showed that probiotics may be effective for preventing AAD. Probiotics were generally well tolerated, and minor side effects occurred infrequently, with no significant difference between probiotic and control groups. Side effects reported in the studies include rash, nausea, gas, flatulence, vomiting, increased phlegm, chest pain, constipation, taste disturbance, and low appetite. The current data suggest that Lactobacillus rhamnosus and Saccharomyces boulardii at a high dosage of 5 to 40 billion CFU/day may prevent the onset of ADD, with no serious side effects documented in otherwise healthy children. This benefit for high dose probiotics needs to be confirmed by a large well designed randomized study. No conclusions about the effectiveness and safety of other probiotic agents for pediatric AAD can be drawn. More refined studies are also needed that evaluate strain specific probiotics and report both the effectiveness (e.g. incidence and duration of diarrhea) and safety of probiotics.
Probiotics for the prevention of pediatric antibiotic-associated diarrhea (AAD)
9 November 2011