I had to have a kitten put down yesterday, and the others (I have 4, 4 week olds) were quickly following suit with symptoms that I am pretty convinced were due to the Hartz KMR. Id been feeding them the powdered version of it, and it just started happening after the newest container I bought. The symptoms are horrendous…its like they become paralyzed, unresponsive, limp…they just lay there. Its terrible. I was a mess yesterday. After having to euthanize the 1, I went to the local pet store and bought PetAg KMR, and fed that to the remaining 4 (who by now were definitely exhibiting the same symptoms). I was convinced I was going to lose them all throughout the night. This morning I was awakened by their “hunger cries”. I was SO HAPPY. They are all bouncy, bubbly, kitties again! Sucked the PetAg KMR right down, purring and all! I cant say for sure, and I dont want to alarm anyone, but in my opinion, and also after researching the horror stories about Hartz products, I would discontinue use. If you have a local pet store, check it out, they may have the other KMR..or you can see if they can get it for you…or you could probably even order it online. Good luck, I hope all goes well 🙂