Well, live yoghurt in preference to errr... non-live (it doesn't seem to be called 'dead' yogurt whereas 'live' yoghurt is called 'live'

)
Antibiotics indiscriminately kill bacteria & there are a whole host of 'beneficial' bacteria in your gut. Live yoghurt, when eaten during a course of antibiotics, supposedly helps to maintain the population of beneficial bacteria.
It tastes good, too! Proper live natural organic yoghurt... made from proper full-fat milk

Yummy! None of yer low fat malarkey with guar/xanthan gum stabilisers