How effective is oral rehydration therapy for traveller's diarrhoea?

Frequent loose stools remove water and salts, especially in hot climates or during long journeys. Oral rehydration solution replaces those losses in a form designed for intestinal absorption. It does not kill bacteria, parasites or viruses, and it will not address blood in stool or severe abdominal illness. The aim is to keep circulation and urination supported while the cause is assessed if symptoms persist.

Carry sealed sachets and prepare them with safe water exactly as directed. Take small sips often, particularly after each loose stool, and continue light food when appetite returns. Avoid alcohol and very sugary drinks, which can worsen diarrhoea. Use careful hand hygiene and safe food and water choices. If you need treatment advice abroad, contact a local clinician; Oral Rehydration Therapy explains the general approach.

Obtain urgent medical help for blood or black stool, severe belly pain, persistent vomiting, confusion, fainting, breathing difficulty or inability to drink. Arrange prompt review for fever with marked weakness, signs of dehydration, or diarrhoea that continues after you return home. Children, older adults and people with chronic illness should seek advice earlier because fluid loss may become serious sooner.

Ask whether your symptoms need testing, whether any travel medicines are suitable, and how to replace fluid safely with your medical history. Ask what symptoms mean you should stop travelling plans and attend a clinic.