Acute diarrhoea, although tends to be a self-limiting disease in otherwise healthy people, continues to cause millions of deaths every year, particularly in infants and the elderly. Therefore it represents a very frequent medical problem with a significant societal impact such as health-care utilisation and lost working days by caregivers. Dehydration, the most frequent and severe complication occurs in the first 48 hours from the onset of the disease. For this reason, the WHO considers this time frame the more critical period where we should mostly act. Oral rehydration solution is the most...