In infants and children, the treatment of acute diarrhoea with glucose-based electrolyte solutions results in rehydration but does not reduce the severity and duration of diarrhoea. In german-speaking countries, rice- and carrot-based solutions have a long tradition in the treatment of diarrhoea and may also reduce stool output and the duration of diarrhoea. Therefore, we evaluated the efficacy and safety of a carrot-rice-based rehydration solution (Na 57 mmol/L, n = 70) and two conventional glucose-based solutions with high or low sodium concentrations (Na 90 mmol/L, n = 48 or Na 55 mmol/L, n = 60) in a prospective study. The study subjects were Pakistani boys and girls between 3 and 48 months of age with mild or moderate dehydration. We measured duration of diarrhoea, fecal and urine output, fluid intake and serum electrolytes. The duration of diarrhoea was significantly lower (p less than 0.05) in the group receiving the carrot-rice based rehydration solution (59.5 +/- 30.9 h) than in the groups receiving the high-Na (75.5 +/- 30.5) and low-Na (74.8 +/- 32.5) glucose-electrolyte solutions. The mean fecal output (p less than 0.01) and fluid intake (p less than 0.001) were also significantly lower in the infants and children receiving the carrot-rice-based rehydration solution. No major electrolyte imbalances were observed in the three groups. We conclude that the carrot-rice-based rehydration solution was safe and more effective than two conventional glucose-electrolyte solutions in the rehydration of infants and children with acute diarrhoea.