Antibiotics to prevent Diarrhoea.
This is reasonable for short trips (less than 3 weeks). Indications include persons with

• Inflammatory bowel disease, Immunocompromised persons including individuals who have had their spleen removed or poorly functioning spleen (eg  Hodgkin's lymphoma).
• Insulin dependant diabetics
• Persons on strong H2 blockers or proton pump inhibitors.(Losec, Somac, Zantac)
• Business travellers whose purpose of the trip would be ruined will often chose this option. - Norfloxacin 400mg daily, Ciprofloxacin 500mg daily or Bactrim 1 DS daily could be used. Doxycycline is less effective. Azithromycin is useful for pregnant women and children ** WHO