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Gastroenteritis Possible therapeutic alternatives
Gastroenteritis: Traveler's diarrhea Common pathogens
Ciprofloxacin 500mg po bid or Levofloxacin 500mg po qd x 3 days.
Bactrim DS po bid x 3 to 5 days. [Cyclospora, Shigella, Vibrio cholerae]
Azithromycin 500 mg once daily X 3 days
Gastroenteritis: severe diarrhea Common pathogens
Ciprofloxacin 500mg po bid OR Levofloxacin 500mg po qd x 3 to 5 days.  OR
Bactrim DS po  q12h. 
Pathogen Specific
Clostridium difficile: 
Metronidazole 500mg po tid x 10-14 days or  Vancomycin 125mg po qid x 10-14 days. 
Ciprofloxacin 500mg po q12h or 
500mg qd x 3d.
tinidazole 2gm PO x 1 dose or nitazoxanide 500mg PO bid x 3 days
Ciprofloxacin 500mg orally bid x 3 days or Bactrim DS (1 tablet) orally bid x 3 days or
500mg orally x 1 day then 250mg orally once-daily x 4 days


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