Treatment of Diarrhea with Probiotics

Clinical Evidence and Efficacy

Probiotic preparations, such as Bacillus clausii, may be offered to reduce symptom severity and duration in immunocompetent adults and children with infectious or antimicrobial-associated diarrhea, as recommended by the Infectious Diseases Society of America 1, 2
The effectiveness of probiotics is strain-specific and dose-dependent, with significant reduction in stool frequency and improvement in stool consistency, according to the European Society of Pediatric Gastroenterology 3, 4

The American Gastroenterological Association suggests that while probiotics are generally considered safe, they should be used with caution in severely immunocompromised patients 1
Probiotics should not be considered a substitute for proper rehydration therapy, which remains the cornerstone of diarrhea management, as stated by the World Health Organization 1, 3

The Centers for Disease Control and Prevention recommend monitoring for reduction in stool frequency and improvement in stool consistency, and if no improvement is observed after 3 days of treatment, reassessment of the underlying cause of diarrhea is recommended 2
For persistent symptoms beyond 14 days, the European Society of Pediatric Gastroenterology suggests considering non-infectious causes including lactose intolerance, inflammatory bowel disease, or irritable bowel syndrome 2

The Infectious Diseases Society of America guidelines suggest that probiotic preparations may be offered to reduce symptom severity and duration in immunocompetent children with infectious diarrhea, with the typical treatment course being 5-7 days, which aligns with the natural course of most acute infectious diarrhea episodes and allows sufficient time for the probiotic to exert its beneficial effects on gut flora, as part of a comprehensive management plan that includes oral rehydration therapy and resume age-appropriate diet during or immediately after rehydration is completed 5
The Infectious Diseases Society of America guidelines recommend resuming age-appropriate diet during or immediately after rehydration is completed, and consider zinc supplementation for children 6 months to 5 years of age, particularly in zinc-deficient populations or those with malnutrition 5
The Infectious Diseases Society of America guidelines advise against using antimotility drugs, such as loperamide, in children under 18 years of age, as this is absolutely contraindicated 5