To a one-year-old child, we went on vacation to our sea, in the end…

To a one-year-old child, we went on vacation to our sea, in the end, everyone had diarrhea, we came back to ourselves more or less, and the son has diarrhea for 5 days already, the doctor prescribed Enterofuril, Bifidumbacterin, Kreon, Nan 3rd comfort, but there is no result yet. Can you tell me ?, maybe someone encountered something that helped, could anything be strengthened for the child?