What should you know about oral rehydration salt formula?

Diarrhoea, vomiting, fever, sweating, or poor fluid intake can remove water and electrolytes from the body. The formula is designed so sodium and glucose support water absorption in the small intestine. It replaces more than plain water alone, while its taste may be mildly salty. It does not treat the infection or other cause of fluid loss.

The balance matters. A packet is made for a specified volume of water, so adding too little or too much can change the concentration. A homemade mixture can be measured incorrectly and may not match a prepared product.

Read the packet instructions and dissolve the entire sachet in the stated amount of safe drinking water. Stir until the powder disappears; do not add extra sugar, salt, juice, or milk. Offer small, frequent sips, especially after vomiting. If vomiting occurs, pause briefly and restart more slowly. Keep the prepared liquid covered and follow the packet guidance for storage and disposal.

Continue usual age-appropriate feeding when possible. Breastfeeding can continue. A pharmacist or clinician can advise on the right product and amount for an infant, an older adult, or someone with kidney, heart, or other medical conditions.

Seek urgent medical care for confusion, unusual sleepiness, fainting, trouble breathing, a seizure, cold or mottled skin, or inability to drink. Get prompt advice if a child has very few wet nappies, if urination becomes markedly reduced, or if repeated vomiting prevents even small sips.

Blood in stool, severe abdominal pain, a high fever, or diarrhoea that is worsening also needs clinical assessment. Oral rehydration can support fluid replacement while help is arranged, but it should not delay care when dehydration appears severe.

Ask which formulation suits the person who is unwell, how much to offer, and whether any medicines or medical conditions change its use. You can also ask when ongoing diarrhoea or vomiting should be investigated.