See another vet ASAP.
Gail

Your vet is incompetent. Seek 2nd opinion, immediately.

No clue about what it might be... but I think I'd see another vet. I don't
like the "I don't know what's going on so you might as well put the cat to
sleep"

Sounds iffy to me.. Could it be poison?Could the cat have gotten into
something? Sometimes reactions to toxic stuff are very weird..

Or is it a balance issue? ear problem?

If your vet does not know what is happening, he/she should refer you to a
specialist. Vets are the same as GP's and when they can't figure things out
they should provide you with the option of seeing a specialist.

Just curious, how old is this cat and has she been monitored while on the
medication?

I hope your cat has shown some improvement overnight.  It's difficult to
guess as to what is going on with her.  Possibilities include weakness,
trauma or a neurological problem and the latter seems more likely to me.
I've seen strange weakness syndromes in cats with low potassium levels but
that should have been detected when blood tests were run (were blood tests
done?) Neurological problems occur due to lesions in the spinal cord or the
brain.  A spinal cord lesion affecting the front legs would also affect the
hind legs therefore in her case it would more likely be a brain stem injury.
Possibilities that come to mind include a blood clot, fibrocartilaginous
embolism (FCE), feline ischemic disease, FIP, cancer and perhaps
toxoplasmosis.  Your vet can send blood for toxoplasmosis titres.  You may
have to consider seeing a neurologist and having an MRI and spinal tap
performed but this will be expensive.  Feline ischemic disease and perhaps
FCE may resolve with time so if she's not painful and eating you might want
to give her some more time.

J. dvm

Hi:

My cat is 19 years old, and about a year and a half ago (when she was
18), she had what we suspect to be a stroke.  At around midnight the
night before,
she emptied her bowels on the carpet and then suddenly ran to the couch
where she curled into a tight ball.  My brother saw this, but just
cleaned
up the mess and didn't disturb her.  The next morning, instead of
demanding food as she usually does, she was still curled into a ball.
When we
put her on the ground, we discovered that she couldn't move her hind
legs.

We took her to the vet - she couldn't figure out what was wrong but
suspected that it was some kind of problem in her brain (like a
stroke).  She also
told us that she thought my cat was blind.  So we just took
her home and expected that she wouldn't live very much longer (my
grandfather died after never recovering from stroke).

However, she was still eating normally throughout the entire ordeal,
and she actually recovered almost all mobility within a week.  At first
she was just dragging
herself around, and then she started forcing herself to walk.
Gradually (over the course of the week) her walking improved.  The next
time we took her to the
vet, the vet was shocked, and also told us that she seemed to have
recovered most of her eyesight.  She seems fine now.

So perhaps your cat is also experiencing something like this - please
don't consider putting her to sleep too quickly.