Vet gave me Mirtazapine instead of Cypro for my 17yr old with IBD & now CRF. Gave him some this am about 4 hours ago and now he is restless and calling. He keeps going to the food dish and eating a few bits, sits for a few minutes, wanders around & vocalizing. This just isn't like him at all......kind of like a stoned cat with the munchies. VIN site says this is a reaction having to do with seratonin levels. I should have done some reading BEFORE I gave it to him...geez. Of course the antidote to it is Cypro and I don't have any left Anyone have any experience with this stuff? How long does it take to wear off??? Can this turn really bad?? What do I watch for ?? Of course my vet is gone for the weekend which leaves the ER........ After all that has happened in the past few months I am really paranoid!