I called the vet yesterday, she suggested trying other samples of prescription foods and using an appetite stimulant. I'm wondering if it is at all possible the Gabapentin is affecting him wanting to eat? He has one more day of it today. Our other cat went through a period where she wouldn't eat and it was because she had some sort of respiratory thing and she couldn't smell. I think she had cat herpes. Once she got over that, she went back to eating.