I was put an antibiotics for acne as a teenager. Once I stopped I had IBS, and still have it to this day. What helped the most was a fecal transplant.
Of course, going on them for years is pretty different from a course of a week or two, and different antibiotics will have different effects.
I know gut biomes must be different but they must be orders of magnitude more different than I assumed. I don't know what else would explain a little dose nuking people's gut biomes, while we experience absolutely nothing.