Abstract
The use of preventive measures and self-treatment for travelers' diarrhea is routine in regions where the occurrence of diarrhea is predictably high. People traveling to these areas who do not exercise care in their selection of consumed foods and beverages will suffer high rates of illness. Such diarrhea normally affects the traveler for a day, although it can result in chronic postinfectious irritable bowel syndrome. Although systemic antibacterial drugs are effective in preventing diarrhea, their use is not routinely recommended because of side effects and their importance as a therapy for extra-intestinal infections. This review focuses on current and future uses of antibacterial drugs in the prevention and therapy of travelers' diarrhea. Minimally absorbed (<0.4%) rifaximin can effectively reduce the occurrence of travelers' diarrhea without side effects. Bismuth subsalicylate is a useful alternative, although it is less effective than rifaximin for the prevention of travelers' diarrhea and the required doses are less convenient. All people who travel to high-risk areas should take curative antimicrobial agents with them for self-treatment of illness: rifaximin 200 mg three times a day for 3 days, or an absorbable agent such as a fluoroquinolone or azithromycin taken in a single dose initially, with the need for a second or third dose determined by clinical response. Loperamide (up to 8 mg per day for ≤2 days) can be given with the antibiotic to offer rapid symptomatic improvement. In the future, the ability to evaluate the genetic risk of illness acquisition might allow person-specific recommendations to be made.
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Acknowledgements
The travelers' diarrhea studies by the author that are reported herein have been supported by active grants from, among others, the US Public Health Service, which funds the Texas Gulf Coast Digestive Diseases Center, the National Institutes of Allergy and Infectious Diseases, and the Clinical Research Center, which funds the University of Texas General Clinical Research Center.
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The author would like to acknowledge that over the last 30 years he has received a consultant fee, honoraria for speaking and research grants to his institution from various pharmaceutical companies: A.H. Robins Company; Alfa Wassermann SpA; Bristol-Myers Squibb; Burroughs Wellcome Company; Ciba-Geigy Ltd; Hoffmann-LaRoche Inc; Janssen Pharmaceutica; McNeil Consumer Products; Merck Sharp and Dohme; Merrell Dow Pharmaceuticals Inc; Norwich Pharmacal Company and Norwich-Eaton Pharmaceuticals; Ortho Pharmaceuticals; Otsuka Pharmaceuticals; Procter & Gamble Company; Romark Laboratories; Shaman Pharmaceuticals Inc; Salix Pharmaceuticals (the manufacturer of rifaximin); SmithKline Beecham Biologicals; Upjohn Company; and Zyma SA.
Glossary
- POSTINFECTIOUS IRRITABLE BOWEL SYNDROME (IBS)
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A common, chronic illness causing abdominal bloating with diarrhea and/or constipation following an initial bout of infectious diarrhea
- PROBIOTICS
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Live bacteria that can be taken orally, potentially providing protection against subsequently ingested pathogens
- DOXYCYCLINE
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An oral tetracycline antibacterial drug
- TRIMETHOPRIM-SULFAMETHOXAZOLE
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A combination antimicrobial drug currently not recommended for the treatment of travel diarrhea because of high rates of resistance worldwide
- FLUOROQUINOLONES
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Considered by many the optimal drugs for therapy and prevention of travelers' diarrhea; antibacterial resistance to ciprofloxacin is, however, high
- WATERY DIARRHEA SYNDROME
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Liquid stools that are commonly passed by patients with travelers' diarrhea, particularly in cases caused by diarrheogenic E. coli
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DuPont, H. Travelers' diarrhea: antimicrobial therapy and chemoprevention. Nat Rev Gastroenterol Hepatol 2, 191–198 (2005). https://doi.org/10.1038/ncpgasthep0142
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DOI: https://doi.org/10.1038/ncpgasthep0142
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