Thanks for the comment. I am seeing a feline Neurologist today. I've been doing much research online and just seem to find much higher dosages of these drugs being dispensed for cats with similar problems. My vet seems to be afraid of liver toxicity. My understanding is that if that should happen it would be a distant event and the cat may not have long to go.
Eh...your only option is to try a few different vets and see if one will go along.
I understand your attitude if "He's going to die anyway at this rate, why not try it?"
but your vet is probably concerned about lawsuits and government fines for malpractice if the medication causes a "death related event" (legal ease, sorta) The FDA can go after him for prescription misusage if he isn't careful and pull his license or fine him.
So you can hope that he's just playing it safe and maybe another vet may be more lenient and less afraid of consequences.
Let us know how kitty is doing, and sorry for the troubles.