Hi and thanks for the question,
antibiotics rarely or in this case, the blood should not be attributed to antibiotics. The commonest cause of blood stained stool in children under 5 is caused by Shigella
, a bacterium.
She is already on antibiotherapy.
It shall be necessary for a stool direct exam, culture and sensitivity tests to be done. This shall detect the exam causal organism and sensitive drug. Other causes like Amibiasis (Entamoeba) could also be implicated. A careful physical examination, coupled will this test shall guide diagnosis, and determine treatment or further testing for a comprehensive and adequate management.
Having him drink much water as you book to see his pediatrician
, to me, is the ideal thing to do.
Thanks and best regards,