Why are oral rehydration salts used in oral rehydration therapy?

When the body loses fluid, it also loses electrolytes such as sodium and potassium. Oral rehydration salts are designed to be dissolved in the stated amount of safe water, creating a solution with the right balance of glucose and salts for intestinal absorption. Plain water can be useful for thirst, but it does not replace that balance during meaningful fluid loss.

Oral rehydration therapy can be especially useful when small amounts of fluid can be kept down. It does not stop the cause of diarrhoea or vomiting, and it may not be enough when dehydration is severe or a person cannot drink safely.

Use a commercially prepared packet and mix it only with the amount of water stated on the packet. Do not add extra salt, sugar, juice, milk, or fizzy drinks, because changing the mixture can make it less suitable. Offer frequent small sips; if vomiting occurs, wait briefly and restart with small amounts. Continue normal feeding when it is tolerated, particularly for children.

Use clean hands and safe drinking water. Follow packet storage and discard instructions for prepared solution. Oral Rehydration Salts explains the product, while Oral Rehydration Therapy covers the clinical approach.

Seek urgent medical care for confusion, unusual drowsiness, fainting, severe weakness, very little urine, inability to drink, repeated vomiting that prevents fluids staying down, or signs of dehydration in a young child such as markedly reduced alertness or dry mouth. Blood in stool, severe abdominal pain, or a rapidly worsening illness also needs prompt assessment.

Ask how much and how often to offer oral rehydration solution for the person's age and illness, what food and drinks are appropriate, and which warning signs mean home treatment should stop. Mention kidney disease, diabetes, heart disease, or any condition requiring a restricted fluid or salt intake.