Quote Originally Posted by Strigon View Post
If I were to speculate, I would say that there is likely no difference in the amoxicillin given to fish and the amoxicillin given to humans...
Staying away from actual advice, in the US, amoxicillin for ornamental fish has not been approved for usage by the FDA. This means there is absolutely no quality control or guarantee on the purity, efficiacy or even quantity of amoxicillin in the tablets, making them somewhat suspect for fish, let alone for humans.

Apparently a lot of tablets say 'USP' or pharmaceutical grade - the USP is just a supplier of (primarily) reference standards and so not a guarantee of quality - it's like a fast food place promoting their burgers by saying they look exactly like In-N-Out burgers; it doesn't mean they have the same taste, quality of ingredients or even the same level of food hygiene and safety.