I really feel you should talk to your vet. If her cancer is inoperable and you're just administering palliative care, and the medicine might help her live a little more comfortably, maybe you should give it to her. Also, talk to the vet about maybe removing the tumor for her comfort. (I don't know what your finances are like.)
I'm saying these things, because I lost a kitty to cancer in 2009. She was also on a medicine that was really not good for her. She also suffered seizures and had an undiagnosed heart murmur (meaning they knew she had it, but they did not know why.) The medicine she was on that was bad was prednisolone. When she stopped eating, she also stopped getting the medicine, and I really feel that might be what took her. (She was only 13. :( )
My point is that you want to keep her comfortable and minimize her suffering. Maybe the medicine will give her some relief. :(
I also want to recommend a Yahoo! group that is very, very good. It's called feline-cancer. If you go to Yahoo! groups, you can do a search for it.
I'm so sorry for what you are going through. :(
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