thanks for writing to health care magic.
is normally prescribed in conditions like Amoebiasis
Normally the belly of a 18 month is protruberant and nothing needs to be done for this condition.
what is the weight of the baby. does she have any other complaints.
if there are no other complaints like blood in the stool........... etc such drugs are not required to be used.
Metronidazole is not laxative
hope this helps