>And you can buy antibiotics that are sold for pets that happen to be the same as the antibiotics manufactured for human

Yes, but there's a quality control aspect there that makes one a touch uncomfortable. My fish getting a little something extra in their amoxicillin is something I stress far less about then if I'm the one taking the pill.

That was my first thought too, but if I think I might go septic soon, I'm gonna take that risk. Additionally, I believe if the imprint codes match on a commercial product, you can be reasonably sure it was forced to go through all the same process: https://www.drugs.com/article/imprint-codes.html. I'm not a doctor, obviously. Sharing my possibly flawed understanding, not giving advice.

If the apocalypse was happening outside my bunker a little extra amoxicillin would be the least of my worries.