I found it at Petco (in the store) a few years ago.
http://www.petco.com/product/6441/Pet-Organics-Good-Cat.aspxIt's a homeopathic formula that you put in the drinking water.
This stuff really works well to calm and relax the cat or cats. I can see a difference within 10-15 minutes. My cat liked extra liquid in her wet cat food and I would add 1/4 tsp or so, plus 1-2 TBL water in with her wet food. This worked better and was more economical than a larger amount in the water bowl, which she drank less of since she had the extra water in with her food. It's odorless and tasteless, and she didn't notice any change with her food (and she was finicky). I started out using it in the drinking water and she was fine with that, before I switched over to using it in her food.
She was very fearful and had never been handled. The "Mom" cat was the same way and only one person could get near her. All the kittens were skittish and wild. I got the last kitten. She was last because she was hardest to catch, but in a "it-was-meant-to-be" way, she was also the kitten that I pointed out in photos as my favorite. (ahhh....)
Luckily, I got her at exactly 8 wks so she became comfortable and loving with me, but no one else. I adored her. We had 16 1/2 yrs together. Anyway, taking her to the Vet was a nightmare - which only became worse as she grew older. She didn't like company or other animals. She would hide and hiss. This stuff just really RELAXED her. It didn't change her personality, but she seemed much happier and more comfortable. It wears off after several hours.
I have tried the Feliway, after my Vet used it with her in the exam room. The results of Feliway were disappointing. I didn't notice much of anything. With Good Cat, there's a definite change. I have used it with my two new cats that I adopted when I first got them. Same results. I really like the stuff! and much cheaper too!
Good Luck to you and Fabi.