Doses for prevention of antibiotic-associated diarrhea arc 250 to 500 mg per day.

In some studies, 1 g a day has been used to prevent antibiotic-associated diarrhea. In terms of actual numbers of live yeast, 10 to 20 billion organisms a day arc usually needed to treat adults. These numbers arc not usually used, but rather the amount in milligrams or grams.