I had to use oral antibiotics about a year ago for reasons that could have been avoided. I was pretty upset about it precisely because it probably wreaked havoc on all the beneficial gut microbes that I had built up over the years.
There are cheddar cheeses though that barely rank the name. Quality over quantity here. Buy the small block of fancy cheddar, not whatever name the food megacorporations are using locally.
I've been prescribed a "fairly serious" antibiotic for a skin condition that has been plaguing me for several years (I've gotten like 5 different diagnosis and tons of different Rx). I'm otherwise incredibly healthy, so this antibiotic scares the shit out of me and I have yet to start taking it.