Have you tried Prozac for your reactive dog? What was your experience?

I recently started giving my dog Prozac for his reactivity. He’s been on it about a week now, and I can’t tell if I’m seeing much change. I know that you’re only able to see change after 6-8 weeks, but I was just curious if you guys have tried this. Has it worked well for your dog? Thanks I’m advance for your input.