I felt just the way you do. I did not want to medicate my cats; I was sure I could figure something else out. The fighting was bad enough but the spraying continued to get worse until I couldn't take any more. Specs shows no signs whatsoever of a personality change. He's still a little punk. LOL But he doesn't pick on Boo any more. He's calm but not out of it. His coordination is fine, his appetite, everything. Just check w/your vet, talk it over w/him and see what s/he says. And watch and observe your cat. You may have to play w/the dosage in the beginning like I did but I'm sure glad my vet suggested it.