We have 8 cats and
We have 8 cats and while this did take the full month for effects to kick in (as the packaging states) we also started two of our cats in fluoxetine, changed our feeding strategy and moved into a bigger home (lol, the last one was only due to work purposes though. . . not the cats). However, there is now peace and harmony (no more staring down other cats, stalking behavior, etc). I'd highly recommend trying the Optimum formula for a multi at household.