For very mild symptoms, cooled boiled water is sufficient. Food and milk should be avoided for the first 12 to 24 hours. Repalyte and Gastrolyte are available in Australia. They are combined with cooled boiled water to form a drink that replaces the salt lost during vomiting and diarrhoea. Sugar is included in these preparations to give energy and with flavouring increase the palatability.
Large volumes distend the stomach and provoke vomiting.
For mild vomiting that persists longer than 24 hours, or if the child or adult is becoming rapidly fatigued and dehydrated a return visit to the doctor or hospital is the best course. Occasionally, milk protein allergy follows acute gastroenteritis with persistent diarrhoea. When the symptoms have settled down in babies, half-strength formula should be introduced for 24 to 48 hours and then full strength formula. Children have little energy reserve and become energy depleted quickly. The early reintroduction of a normal diet when tolerated is recommended.