BEWARE OF SIDE EFFECTS - DO NOT BUY
I bought this to introduce 2 kittens to my 17 year old (all burmese). My beloved old boy became a complete zombie, went off his food and was completely lethargic. I took him to the vet and as he is an indoor car, this Feliway was the obvious reason as it started 24 hours after I had plugged it in. I googled this and others have experienced the same so beware. The downside was that he then caught cat flu at the vets and has been poorly ever since. Not what I wanted for him in his twilight years!