A systematic review has found that taking pro-biotics does seem to lessen the incidence of one of the side-effects of taking anti-biotics - namely diarrhoea.
Bear in mind that the various roles of your large bowel bacterial ‘eco-system’ include helping regulate the re-absorption of water from your large bowel back into your blood stream.
It is not surprising that diarrhoea is a common consequence of disruption to your large bowel bacterial environment from anti-biotics.
This kind of implies that the other important roles of your bacterial eco-system are likely being disrupted too!
Worth bearing in mind if you have to take these medications for any reason - especially for your kids.