As your child is having diarrhea , you can give oral rehydrating solution sips by sips in equal amounts to the losses of water and electrolytes in stools to prevent and correct the dehydration
and you can give oral probiotic
after consulting your Pediatrician
. Pepsigard is used in gastritis and not for loose motions and domperidone
is a prokinetic drug which is used to treat vomitings.