... More to the point, afaik it is not (no longer?) approved for human use, although was originally developed for human use. High overdose risk, etc ...
Bute used to be given to people with arthritis and stuff years and years ago. It was found to be very harmful to livers ect and is now banned for use on humans.
We used to take it when grooming at 3 day events, for the inevitable hangovers. Worked a treat, but in hindsight, it was a really bad idea, and I wouldn't do it nowadays
Its carcinogenic and can cause leukaemia, anaemia and other blood disorders, so I wouldn't! Hence why if a horse has had just one sachet of bute in its lifetime it is never supposed to enter the food chain.
Of course people can take bute. They can also drink surgical alcohol, eat chicken two weeks past it's sell by date and juggle flaming torches in a petrol station.
Had a headache at work the other day, upon rummaging in my bag for painkillers I came across a sachet of Danilon, I was tempted to try a couple of granules!
Danilon is similar to bute, its called suxibuzone and can cause all sort of nasty things. Apparently it was also developed for human use, but hey- they used to give opium to babies.