Well, in that case, I hope you have read this article and many others like it: https://horsesidevetguide.com/bute-banamine
It’s not a legal opinion that you will be held civilly liable for giving a prescription drug without veterinary orders, and the owner of the horse ends up with a dead horse or a horse who is worse off than they were before. That’s legal fact. Again, please read the article I linked to. Banimine and bute are VERY commonly misused.
Actually, my horse’s health is paramount above all else. That’s why I don’t pretend to be a veterinarian and give prescription drugs without vet advice (with obvious exceptions. I will give epinephrine in an emergency because 5 minutes can make the difference between life and death. It’s entirely possible I won’t be able to talk to a vet on the phone in time.)
If you, as a barn staff member, gave my horse a drug without veterinary advice, and pretended to be a vet when you are, in fact, not one, and my horse ended up dead? I’ll be blunt. Not only I would I sue you, but I’d beat the crap out of you until the police stopped me and arrested me for assault. Again, my horse’s health IS the most important thing to me. Which is why I don’t want people like you pretending they are qualified to make decisions that only a vet should be making.
You are aware that in some cases, Banamine can make colic worse, right? If you are not, please read some of the cautionary articles written by veterinarians about it. Again, this is why I don’t want people like you giving prescription drugs to my horse without veterinary advice unless it is a dire emergency. You think you know what you are doing. The simple fact is, you do not. And I can link to several articles regarding the improper use of banamine and bute that prove you do not.