They sell that stuff over here as well. My friend even named his cat after it (if I'm not mistaken, it's called Baldrian in Danish).

I've never tried it on Leo yet, but I think I can remeber my former cat Ivar ( He got hit by a car and died, about a year ago ) was TOTALLY crazy about it. He was also a great fan of catnip, so I 'spose it's no surprise

-Varga