Thinking about this more, and remembering what it was like in my household, I wanted to add a few more thoughts. My experience is the same as Jen's, the medication made Dodger drowsy but didn't stop the stalking and pouncing. It was what he lived for, he couldn't resist no matter how much he knew I hate it. And, as I said, we were intensely closely bonded. I cried rivers over medicating him so that he became sluggish, pushing him away when he misbehaved, isolating him for hours or weeks, making him an outdoor/indoor cat, nothing ever worked.
Does he stalk and pounce when the cats try to use the litter boxes? That's what Dodger did and it led to all kinds of problems. Most of the cats would just dash in and out, knowing he was waiting to jump on them the moment they left their box. Two of them ended up living in a closet in the hall, the closest they could get to the litter room without living in it. When I tried to ease them into the living room, providing them with hiding places, one of them peed and pooped under covered tables. Your cat may use the couch not just to object to her current living conditions but also because she considers it her only "safe" litter area.
I don't think you can re-train a cat not to stalk and pounce. You can train cats that they can't do certain things in certain places, such as not jumping on counters or they are not welcome in a certain room, that's territory and makes sense to them. I don't think stopping a behavior towards other cats does make sense to them.
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