I'm sorry to hear this. I've also been having a lot of problems with aggression, jealousy, and also peeing issues but none of my cats have UTI's.

I recently had to add 3 more litterboxes and I also bought some cat attract litter and put this on top of the old litter that I use. Now they're been using all of the litterboxes and for now the peeing on the carpet has stopped. I don't know if they have this in Germany but you might want to look it up and find out. It's worked well for me.

I'm weaning Storm off of the clomicalm because he's been using the litterboxes again and it's not helping him with his aggressive behavior any more. The Relaxan sounds like something I'd like to try once Storm is off of the clomicalm. Can I buy this or is it a drug that needs a prescription?