Yes, that is a medicine bottle. No, it is not full of medicine. It has been emptied, an old pc mouse ball placed inside as a noisemaker/weight, and the safetly lid firmly replaced. We have some of these tied to string, others in plastic bags, and some loose like this one. They’re cheap impromptu toys that the ferrets find interesting 1 day out of 30.

The brown stick in the foreground is more fun for them. It’s just a plain 1/2″ or so thick dowel rod covered in batting and fleece for grip. Poke a ferret with that, I dare ya! >.>