[chrisco255]

This news story is about a man consuming fish tank additive: https://aquariumstoredepot.com/products/chloroquine-phosphat...

I'm not sure the difference between this and the dosages and chemical makeup of the actual drug being touted by Trump but I imagine anyone with a lick of sense would avoid consuming chemicals designed for fish tanks.

[mattkrause]

It's the phosphate salt vs. the sulphate one used in the human medicine (Plaquenil).

Both counterions get used in medicines, but it's tough to say in general if it matters: sometimes it makes a difference, other times it's just whatever's easier/cheaper to make.