OTC
Probiotic (beneficial yeast supplement)
Saccharomyces boulardii
Last reviewed April 2026
Who is this for?
What is this drug?
Saccharomyces boulardii is a beneficial yeast (a type of probiotic) that helps restore the natural balance of good organisms in your gut, which helps your digestive system work properly and fight off harmful bacteria.
What is it used for?
Diarrhoea (running stomach)antibiotic-related diarrhoeatraveller's diarrhoeastomach upset from infectionsprevention of recurring diarrhoea caused by a germ called Clostridium difficile
Available Over The Counter
Available at pharmacies without a prescription. Rules may vary by country.