No data are available regarding the use of this medicine during breastfeeding nor have been reported adverse effects in the baby.
While there is insufficient data about the behavior of this substance in the nursing mother and the child, it is preferable not to use during breastfeeding.
Warning of the manufacturer:
It has been shown that ondansetron passes into the milk in lactating animals. It is recommended, therefore, that nursing mothers not breastfeed their children if they are taking ondansetron.