K.S.
I use the culturelle for my DD. I sprinkle it in drinks or in cereal or whatever. Haven't had the antibiotic issue but have heard the same thing that Shelley said. I know for myself I have used a probiotic during or after antibiotics so I don't get a yeast infection and it seems to work.
I don't do it everyday, more like every other. There is also a chewable one if your kids are old enough.