Um... don't remember exactly what happened, but I remember one of my buddy had that problem 4~5yrs ago. These poison stuff do kill &/or make rats sick enough to make them avoid it. But later down, new one comes back. Worse part is AFTER part. All the dead rats plus their shit in the nest bring bugs and smell to it.
One thing to another thing got my buddy & fam go crazy. In the end, he pretty much bust every wall and floors. cleaned up the mess. It was a pretty disgusting scene (so he claims). He wanted to remodel the house, wife didn't let him... but he had excuse. So it kinda worked out in his favor. lol but in the future he said he will use repellers by Everpest. Here is an interesting blog about their features
https://everpest.com/blogs/blog.