Prevention of Traveler's Diarrhea

Guideline Position on Alternative Preventive Agents

The Journal of Travel Medicine expert panel states there is insufficient evidence to recommend the use of commercially available prebiotics or probiotics to prevent or treat travelers' diarrhea, with limitations including variability in study settings and diarrhea causes, large variations in dosage and formulations, short follow-up periods, and lack of person-time analysis 1, 3
Studies on biological agents like bovine colostrum suffer from variability in study settings and diarrhea causes, large variations in dosage and formulations, short follow-up periods, and lack of person-time analysis 1

Bismuth subsalicylate may be considered for any traveler to prevent traveler's diarrhea, with a strong recommendation and high level of evidence 2
Rifaximin is recommended when antibiotic prophylaxis is indicated, with a strong recommendation and moderate level of evidence, and dosing of 200-1100 mg daily divided into 1-3 doses 2
Fluoroquinolones are not recommended for prophylaxis, with a strong recommendation 2

Antimicrobial prophylaxis should be considered only for travelers at high risk of health-related complications, including those with a history of clinically significant long-term morbidity following enteric infection, serious chronic illness predisposing to TD-related complications, or severely immunosuppressed travelers 2, 4
The standard approach remains self-treatment rather than prophylaxis to minimize antimicrobial resistance and multidrug-resistant organism acquisition, as recommended by the Journal of Travel Medicine 1, 2

The increasing association between antibiotic use and acquisition of multidrug-resistant bacteria makes the risk-benefit calculation for any prophylactic agent critical, and pre-travel counseling should include this information 1, 3
Food and water precautions remain the cornerstone of prevention, including consuming steaming hot foods, peeled fruits, bottled beverages, and water boiled for >1 minute, as recommended by the Journal of Travel Medicine and Praxis Medical Insights 1, 5