When is oral rehydration therapy recommended for gastroenteritis?

Gastroenteritis can lead to fluid and electrolyte loss. An oral rehydration solution combines water, glucose and salts in a measured balance that helps the gut absorb fluid. It is most useful when losses are continuing, thirst is increasing, urine is reduced or darker than usual, or ordinary drinks are not replacing what has been lost. Small sips are often easier to tolerate than a large drink. Young children, older adults and people with chronic illness may need advice sooner because dehydration can develop quickly.

Use a pharmacy oral rehydration product and prepare it exactly according to its label. Sip it frequently rather than drinking quickly. If vomiting occurs, pause briefly and restart with smaller sips. Continue breastfeeding and return to usual light foods as tolerated. Avoid alcohol, and do not add extra powder, juice or fizzy drinks. People with kidney disease, heart failure or a prescribed fluid restriction should check with a clinician before increasing fluids.

Seek urgent help for confusion, fainting, unusual drowsiness, severe weakness, blood in vomit or stool, severe pain, or inability to keep fluids down. Prompt assessment is also needed for very little urine, worsening dizziness, or symptoms that are not improving. Anyone who is unconscious or confused should not be given a drink by mouth.

Ask which solution is suitable, how to adjust sipping if vomiting continues, and which changes in urine, alertness or symptoms should trigger an urgent review.