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Travel health information for people travelling abroad from the UK

Travellers' Diarrhoea

The Illness

Travellers’ diarrhoea is defined as passing 3 or more loose/watery bowel motions in 24 hours. Only ~ 3% of cases have 10 or more bowel motions daily. It may be accompanied by any of the following symptoms; fever, abdominal cramps, urgent need to pass bowel motion, nausea or vomiting.

Most cases occur in the first week of travel and are mild, i.e there are no other symptoms and it does not disrupt normal activities. On average, symptoms last for 3-5 days and most cases resolve without any specific treatment. When travellers’ diarrhoea is associated with additional symptoms and this leads to an interruption of normal activities, it is classed as moderate to severe.

Travellers’ diarrhoea can be caused by many different organisms including bacteria, such as E. coli and Salmonella, parasites such as Giardia, and viruses such as norovirus. All these organisms are spread through eating/drinking contaminated food/water or contact between the mouth and contaminated hands, cups, plates etc.

Loose bowel movements can also result from a change in diet including, for example, spicy or oily foods.


This depends mainly upon practising good hand hygiene and effective food and water precautions

  • Hands should be washed thoroughly before eating or handling food, and always after using the toilet. Sanitising alcohol hand gel is an alternative when washing facilities are not available.

Diarrhoea may occur even in travellers who stick strictly to food and water precautions; in many destinations the risk is determined by local food hygiene and sanitation practices.

Additional preventive measures may be considered in specific situations, see below. 


Preventing dehydration during an episode of travellers’ diarrhoea is important. Antibiotics are unnecessary in most cases.

Mild/Moderate Travellers Diarrhoea

The priority in treatment is preventing dehydration, especially in young children.

  • Clear fluids such as diluted fruit juices or oral rehydration solutions (purchased as packeted oral rehydration salts in pharmacies) should be drunk liberally.
  • All rehydrating drinks must be prepared with safe water.

Antidiarrhoeal Agents i.e Loperamide or diphenoxylate plus atropine can help, particularly with associated colicky pains.

Please note:

  • They are not recommended for use in children under 12 years of age.
  • The effect of loperamide is not instantaneous and may take 1 - 2 hrs to reach its maximal effect.
  • Overuse can cause rebound constipation.

Severe Travellers’ Diarrhoea

Medical attention must be soughtso that intravenous fluids can be administeredif diarrhoea is severe, associated with blood and mucous in the stoolor marked vomiting, fever, pain, bleeding or dehydration can occur. ,Antibiotics may be given depending on the cause.  Antibiotics are effective against bacteria, the cause of most cases of travellers’ diarrhoea. They will not improve diarrhoea due to other causes.

If no medical treatment is readily available, rehydration is essential and antibiotic self-treatment may be used. Antibiotics should improve diarrhoea within 1–2 days.

Consider taking self-treatment if you:

  • Are travelling to remote rural areas, distant from medical help
  • Have pre-existing bowel problems such as inflammatory bowel disease where infection may trigger a relapse.
  • Have pre-existing medical conditions which may be worsened by severe infection or dehydration, i.e. poorly controlled diabetes, renal impairment etc.
  • Have a tendency to severe travellers’ diarrhoea (on the basis of previous travel experience).

Antibiotic dose for self-treatment (adults only)

The choice will be influenced by history of antibiotic allergy, other medications being taken including antibiotic prophylaxis and travel destination.

If symptoms persist without improvement after 72 hours medical help should be sought.

  • Azithromycin 500-1000mg for 1 day or 500mg once daily for 3 days.
    • For travel to SE Asia/India
    • Best regime if associated fever or blood/mucous in bowel motions.
  • Rifaximin 200mg three times daily for 3 days.
    • Do not use if symptoms of invasive diarrhoea are present (blood/mucous in stool).
  • Ciprofloxacin 750 mg once daily for 1 day or 500mg twice daily for 1 day.
    • If no improvement can be used for 3 days.
    • Avoid in SE Asia/India due to antibiotic resistance.

Please note: all antibiotics have side effects and may affect/be affected by other medications taken at the same time. Always read the patient information leaflet that accompanies the antibiotic or discuss with your doctor/nurse before taking the medication.

Additional Preventive Measures

In certain situations additional measures may be considered to reduce the likelihood of diarrhoea developing. This is not a substitute to practicing good food and water hygiene.

Measures include:

  • Tablets to prevent diarrhoea (chemoprophylaxis) – antibiotics and non-antibiotics.
  • Vaccination.

Tablets to Prevent Travellers' Diarrhoea

Tablets to prevent diarrhoea are not routinely recommended as their side effects may be worse than the diarrhoea. Widespread use of antibiotics also causes drug resistance to develop in bacteria. However prophylaxis might be offered in selected circumstances, for example:

  • During a very short tour (3-5 days) when loss of even 12-24 hours would seriously impact on the success of the visit.
  • Pre-existing bowel problems such as inflammatory bowel disease, or severe medical problems, such as diabetes, where an attack of diarrhoea/dehydration could seriously aggravate symptoms or cause relapse.

Non-antibiotic Prophylaxis

  • Bismuth subsalicylate
    • An effective, non-antibiotic approach to prevent travellers' diarrhoea with an overall efficacy of about 60%.
    • Available in tablet (Pepto-bismol tablets ) or liquid formulation (Pepto-bismol liquid or Boots Pepti-calm).
    • To prevent travellers diarrhoea - two tablets or 30 ml are taken 4 times daily (max of 16 tablets or 240 ml) at meal times and on retiring.
    • Causes blackening of the stool and tongue.
    • Should not be used for more than 3 weeks.
    • Should be avoided in those on salicylate (aspirin) preparations or warfarin, those with hypersensitivity to salicylates and children under 16 years of age.
    • May interfere with the absorption of doxycycline used for malaria prophylaxis.

Antibiotic Prophylaxis

  • Rifaximin 200mg twice daily or 600mg once daily.

Please note: all antibiotics have side effects and may affect/be affected by other medications taken at the same time. Always read the patient information leaflet that accompanies the antibiotic or discuss with your doctor/nurse before taking the medication.


Pre and probiotics have been suggested as both treatment and prevention of travellers’ diarrhoea. There is not yet any convincing evidence that they are effective. They are not recommend for either prevention or treatment.


No licensed vaccines are available in the UK against travellers' diarrhoea

Dukoral® (the oral cholera vaccine) may give some protection against diarrhoea caused by one strain of E. coli (ETEC) but not other bacterial, parasitic or viral causes. It is not licensed for this use and is not routinely advised for travellers.

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