Good point. Yeah, don't use antifreeze if there's a chance it will get loose and kids or animals will get to it, or it goes into your well or a stream or lake.
It's toxic. And it's sweet - so children and animals are likely to drink bunches if they drink any.
The intoxication is the first of three stages - but it's the third stage that kills, by destroying the kidneys.
If somebody gets poisoned by it, feed them alcohol (even if underage or nonhuman - but watch the dose vs. weight) while waiting for the paramedics. (Like methanol, the damage is really done by the metabolites formed when the enzymes that normally digest ethanol break it down. The enzymes prefer to bind with ethanol. So you can keep them busy while much of the nasty is excreted unmodified.)
In the third world they mix in some bitter stuff to keep kids and animals from drinking a bunch. I have no idea why this is not done here.
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