Probiotic: A microbe that protects its host and prevents disease. The best-known probiotic is Lactobacillus acidophilus, which is found in yogurt, acidophilus milk, and supplements. Probiotics counter the decimation of helpful intestinal bacteria by antibiotics. Probiotics given in combination with antibiotics are therefore useful in preventing antibiotic-associated diarrhea. The yeast S. boulardii and three strains of Lactobacillus have also been shown to be useful in this regard.
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Last Editorial Review: 5/13/2016