In regards to oral Abx being harmful to some and depending on how many you take over a period of time what about IV abx? Can they technically damage you? I thought they probably would not given they are a liquid.
There is tons of research about the damages done by antibiotics.
Both oral and IV antibiotics will wipe out your gut-flora. Not a good thing.
And no, that cannot be restored with some simple probiotics. (KDM: Vivomixx) You will have lost thousands of species and try to replace them with just a handful of new ones.
Truly restoring gut flora after heavy antibiotic use may require FMT.