Even if penicillin, it tastes awful, and if you don’t need penicillin does it actually help you at all?

I bit bread like this once and I can still vividly taste it.

I guess it could help kill your gut bacteria.
Hurray, diarrhea!
Doesnt your gut bacteria actually help you break down food? That would make it constipation, no?
Many people get diarrhea when they take antibiotics for long durations. Additionally, the dry weight of human feces is about 25-50 percent gut bacteria.
How much bacteria is in poop? - The Institute for Environmental Research and Education

How Much Bacteria is in Poop? A Deep Dive The vast majority of solid waste is, in fact, alive. Bacteria […]

The Institute for Environmental Research and Education
Very handy for when you’re carrying something that would kill one hemisphere and blind the other