A recent review article that pooled findings from more than 11,000 patients concluded that probiotics were effective for preventing and treating antibiotic-associated diarrhea. About 30% of people treated with a course of antibiotics develop diarrhea, so this is a significant medical issue. Types of probiotics reviewed include Lactobacillus and Saccharomyces boulardii; both were found effective. See NYBC’s entries under Probiotics for details on how to use.
Reference: Hempel S, et al “Probiotics for the prevention and treatment of antibiotic-associated diarrhea: a systematic review and meta-analysis” Journal of the American Medical Association 2012; 307: 1959-1969