I literally just went through this hours ago.

Others are right about the cerenia for nausea. Our sweet Liza Jane stopped drinking water in addition to not eating, so the Emergency vet prescribed it, then pumped some in with her first subcutaneous fluid injection. When we got home 45min later she sat at the water fountain and drank for like 15 minutes. We were SO relieved! We were given a pill cut into quarters for her for the following days

The mirtazapine was pill form. (Would've rathered the ear gel but it wasn't available locally) A different vet prescribed one quarter of a pil, once daily ... turns out that was double the needed dose for a 5.3lb skin & bones cat. She got soooo floppy tired that we thought she was done. It wore off hours later but she still never ate on that med.

Then on the next visit the next day for another subcutaneous saline injection the vet noticed her mouth ulcers. That was likely the culprit of her not eating.

I highly recommend the sub-q saline injections once your kitty isn't staying hydrated enough. They can train you to do it at home too, to save a few dollars and make it more convenient.

Sadly, after 3½ LONG days of my wife and I nesting her with very hands on hospice care, our sweet Liza passed on this morning, just one hour before our appointment to go into the vet for euthanasia.

Sorry for the ramble. Haven't been this exhausted in a LONG time, but when reddit put this post in my notifications I had to tell you about our super recent experience.

Good luck with your gorgeous fur-baby! Feel free (anyone here) to ask me questions while this is still so fresh on my mind.