Have Cat Questions? Ask a Cat Vet Online.
I am sorry to hear you are worried about both of your cats. My name is Rebecca. I am a veterinarian and will do my best to help.
I see the younger cat is doing better. That is good news. There is no antidote or reversal drug for Xanax, you do just have to wait for it to wear off so I am glad his ambulation is better.
Is the older cat being treated for lymphoma, with any drugs or medication? Or are you just doing hospice type care?
You can try stress reducing pheromones like Feliway. They come as diffusers you can plug into a wall socket. It can only be smelled by cats, and has a calming effect. Herbal products like Rescue Remedy, Composure or Stress Away may help.
Try to distract the younger cat with interactive toys, catnip, etc. to give him something to do rather than bother the older cat.
Let me know what other questions you have.
I hope you were able to see my response; I have not heard back from you! Let me know how the cats are doing and if this was helpful.
I always wonder when I don't hear back from a customer if my response was heard, or was helpful. I hope your cat is better!