After those two hours a cat can be affected by catnip again. Not all cats exhibit the same effects from catnip, with about 20 percent not being attracted to the plant, according to Petmate.

Most cat owners know catnip as a treat for their feline friends to roll in and chew, but a new study finds that the common herb has qualities that repel mosquitoes.

Cats will then be resistant to its effects for at least an hour, and if they're given catnip more than once a week or so, they can develop a kind of tolerance.

Catnip can drive kitties of all sizes a little crazy, and its effects have led feline lovers to wonder what makes this little green plant so attractive to them.

Cats on catnip are clearly having a wonderful time – but does it get them high? Our vet explains more… ...

“Some cats may roll around, rub their face against the catnip, vocalize, or ‘zone out’ and lie in a relaxed state.” Like weed, the effects are different depending on how it’s consumed.

A new study reveals that cats may use plants like catnip and silver vine to help ward off mosquitos ...

"Although we can see very euphoric effects on some cats, catnip is safe to our feline friends," assures Dr. Crow.

New research has given scientists a big clue about how catnip produces its intoxicating chemical. And they believe that catnip, once reserved for cats, could one day help humans fight cancer.