bushbush
Established Member
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Minoxidil can kill cats but isn't lethal on humans.
And some substances are toxic to humans but not to other species. Generally, if a drug is toxic to one mammal, it will likely be toxic to another (we share more in common with mice than people here like to admit).
Testing a substance on an animal has the 'luxury' of trying something to see what happens without killing a human, therefore drugs can be approved more readily for animal use.