Yes, I tried this on Storm because he began peeing due to stress and he was also becoming aggressive towards some of my other cats. It made him very tired the first few days. It stopped his inappropiate peeing but it did change his personality.
Later on it didn't seem to help with his aggressiveness so I weaned him off of it and now he's on Calm Spirit Tea Pills which are an herbal supplement and they're helping him a lot without changing his personality. I know that every cat is different so I hope that this will help your cat. Good luck.