I'll probably be arrested for sharing this for some stupid reason. :/ But a couple months ago I was dumb enough to ride my Harley with shorts on. BURNT THE CRAP outta my leg when I was getting off, and the offending wound did sure enough start to show bad signs of infection even though I cleaned it and tried to take care of it. I took "fishmox" following the recommended dosage for normal amoxicilin and within three days the wound looked 100% better. The redness that had started growing around the burn was gone completely, the swelling disappeared, and it didn't hurt like it did. It was about three days after getting hurt that it started getting worse (symptoms I mentioned), and after one day of that I started taking the fishmox. The burn was PRETTY bad. Took weeks to completely heal, and I've got a healthy scar from it. So I'm confident it WAS the fishmox that helped, not just the normal healing process that took MUCH longer.
All healed up, and no ill effects to date. Aside from some disappointment I gained no special underwater breathing powers, and still swim pretty much the same speed I did before.
I should add, yes I have health insurance, and was FULLY prepared to go to the Dr., ER or whatever the second it was needed, but having bought the fishmox I thought it'd be smart to use this oportunity as a test before I was ever in a situation where it was my only option, and THEN find out it didn't work!