Cystitis

Why can't you go back to the vet?  Your cat is sick.

Priscilla

Dr.,

Encourage the cat to drink more. This is not as difficult as it sounds.
Simply feeding canned food will increase the amount of water that a cat
consumes, even though it will physically drink more while taking dry food.
You can even try mixing small amounts of water through the food.

Restrict meal times. Cats that are fed very frequently are more likely to
develop FLUTD than cats with restricted meal times, no matter what type of
diet is being fed. Although many cats like to eat very small amounts through
the day (and night), it is possible to train your cat to eat at specific
mealtimes. Put the food down in the morning, and take it way 30 minutes
later. Do the same thing in the evening. At first, your cat may be upset at
this, but as time goes on, she should become used to the routine.

Encourage the cat to empty its bladder more frequently. Some cats are very
fussy about where and under what circumstances they will empty their
bladder. For instance, many will simply not use a litter tray that has
already been used. So, it is important to clean litter trays that have been
used immediately. It is also a good idea to put out several litter trays
around the house. In these conditions, even if the cat is left alone most of
the day, there will always be a clean litter tray available.

A few of the diets that do contain the acidifiers they are: Science Diet's
CD, Purina CNM, and Wysong's Uretic Diet. Getting your cat to drink more
water is essential in FUS recovery. You will need to monitor your cat's
intake of food and water, and output of urine very carefully, so be sure to
only use a small amount of litter. You'll also want to check the color and
consistency of the urine. You should isolate your FUS kitty from any other
cats in the household to ensure you can monitor, inspect, and encourage
him/her during the recovery time.

I'm not a vet and so am very leery of giving medical advice.  I will tell
you what I did with one of my cats who cannot tolerate the meds for
cystitis.

She totally stops eating when on the medication for a couple days.  I
started giving her water every morning laced with a little milk.  She likes
that and it gets extra fluid in her.  I also started giving her more canned
food instead of all Science Diet prescription.  She has been fine now, knock
on wood, and after a while tired of the milk in water.  She also happens to
be on thyroid meds which she does well with.

--
  Barb
  I can only please one person a day.
  Today is not your day.
  Tomorrow doesn't look good either.

In addition to Iso's good post, I would recommend asking your vet
about possibly turning the medicine into a gel that can be rubbed on
your cat's ear. It may be it's just hard on her stomach. This could be
an option for you. I would really recommend at least calling your vet
to discuss your cat's condition, but a visit would be best. If your
cat is not urinating, she could get a lot worse, *fast*! Good luck.

Karen