[No place for ondansetron in young children with gastroenteritis and persistent vomiting].

At several out-of-hours services primary care, a single dose of ondansetron was compared with standard care (oral rehydration solution (ORS)) in young children with gastroenteritis and persistent vomiting. Although vomiting decreased more often in the ondansetron group compared to the control group in the first hours, ondansetron had no effect on ORS use and did not lead to fewer referrals to the hospital. Unfortunately, the outcome measure diarrhoea was missing as a possible adverse effect of ondansetron. Diarrhoea was reported around 2-3 times more often with ondansetron compared to placebo in four of five other studies in children with gastroenteritis and vomiting. It is therefore questionable whether the limited clinical benefit of ondansetron in children with vomiting due to gastroenteritis outweighs the possible (as yet insufficiently investigated) side effect diarrhoea.