Adult 1 or 2 cap once-bd. Childn >6 yr 1-2 cap daily. Duration of treatment: Acute infectious diarrhea Approx: 1 wk. Prevention of antibiotic-associated diarrhea Start treatment w/in 48-72 hr, continue at least 3 days & not >4 wk. Prevention of C difficile recurrence Start as soon as possible & continue for 4 wk. Prevention of tube feeding-associated diarrhea During period of tube feeding. Max duration of treatment in usual indications: 4 wk.