How effective is oral rehydration therapy for heat exhaustion?

Heat exhaustion develops when heat, sweating and fluid loss leave the body short of water and electrolytes. A correctly prepared oral rehydration solution contains both, helping the intestine absorb fluid more efficiently than plain water alone. It supports recovery, but it does not cool the body by itself or treat heatstroke. Move to a cool place, loosen extra clothing and rest while drinking.

Use a commercially prepared oral rehydration solution and follow its mixing instructions exactly. Give frequent small sips rather than a large amount at once, particularly if nausea is present. Cool the skin with wet cloths or a fan, and avoid alcohol and very sweet drinks. If symptoms are not easing promptly after cooling and drinking, arrange medical advice. More detail is available in Oral Rehydration Therapy.

Call emergency services for confusion, fainting, seizures, loss of consciousness, very hot skin, trouble breathing or inability to drink. These can indicate heatstroke or another serious problem. Seek prompt medical care for repeated vomiting, worsening weakness, little or no urination, or symptoms that persist despite cooling and oral fluids. Read about Heat Exhaustion for related warning signs.

Ask which solution is suitable, how much to drink based on your symptoms, and whether medicines or an underlying condition change your fluid plan. Ask when you can safely return to exercise or outdoor work and how to prevent another episode.