Effectiveness*	Probably effective for antibiotic-associated diarrhea and infectious diarrhea; possibly effective for irritable bowel syndrome symptom reduction and atopic dermatitis for at-risk infants
Adverse effects	Common: flatulence, mild abdominal discomfort
	Severe/rare: septicemia
Interactions	None known
Contraindications	Short-gut syndrome (use with caution); severe immunocompromised condition
Dosage	Dosage should match that used in clinical studies documenting effectiveness: 5 to 10 billion CFUs per day for children; 10 to 20 billion CFUs per day for adults
Cost	$8 to $22 for a one-month supply
Bottom line	Safe and effective for preventing and treating antibiotic-associated diarrhea and infectious diarrhea; physicians should consult http://www.comsumerlab.com or another objective resource for information about the quality of various brands