Yeah JWookie who answered correctly! It is used for colic and fatigue from shipping. This is not an item I have used in my 23 1/2 years of horse experience, but it is something my grandfather swore by. This box is actually from a pile of stuff he gave to me after Volo died. :( It still has the drops in it, but because I am pretty sure this is at least 10 (if not 20) years old, it is sitting in my kitchen as an "artifact" NOT to be used on a horse! LOL!
You can still purchase BELL drops for horses though. I am pretty sure Valley Vet and Jeffers is where I have seen it advertised. Probably not a bad idea to have a bottle in your first aid kit. :)