There are a lot of different rat poisons, it turns out. I only learned this recently because I had a rodent problem in my house, and the province here recently passed new restrictions on which poisons are allowed. The exterminator who was helping me had quite a lot to say about it, as you can imagine.
What I also learned is that being an exterminator gives you a license to use all kinds of crazy shit that us plebes can’t buy. The guy told me that the rat poison you buy in stores doesn’t do squat, basically. He said if you’re not using an exterminator, then you should use traps instead, because the consumer retail poisons are so weak as to be useless.
Just because it needs to be said of course, never use rat poison anywhere that other animals might be able to access it. Many a poor doggo or kitty has been hurt by it.