It works and is reasonably priced. And it is deadly to humans if injected.
We still carry it, but I am particular about how it is used. A good facility with a squeeze chute. Absolutely no cowboying on a rope or squeeze critter behind a gate. Don't try to hurry, be careful with it. There's no antidote or cure if someone gets accidently injected. It causes heart failure.
38 year old cattleman up by Denison IA lost his life a couple of years ago. Syringe loaded in shirt pocket and squeezing big calf behind a gate, somehow shot himself. Knew it was trouble, drove himself to hospital. After a few days on life support they had to let him go.
Draxxin or Zuprevo pretty much work as well and are safer to handle.
