It has been my experience that cats react differently to catnip.
Some will become very mellow and loving like little
Others get VERY active and
Cat nip is an herb and is,indeed, in the mint family. I have always preferred to give my cats the catnip I grow myself because some of the commercially bagged stuff (included that used inside cat toys) has added catnip oil concentrate and some times that is too much of a good thing, (especially), when it is a cat's FIRST experience with cat nip.
A friend of mine (who is a vet and long-time cat owner) says that cat nip does about the same thing for cats that marajuana does for humans. It heightens experiences!
Of course, cat's don't smoke
cat nip, but you will notice them salivating a lot and licking a toy that has cat nip added to it.
I have never had a cat that had an adverse reaction to cat nip, but remember; it is never wise to overdo the use of any stimulant. . .