How High Does Your Cat Really Get When They Eat Catnip?

If you are a cat owner or have at least watched cats in videos posted online, you've likely witnessed what happens when these animals get ahold of catnip. The way felines react to this perennial herb is slightly outside of the types of animal behavior you normally see from them. Interestingly, the effects aren't the same for all cats and differ depending on how the herb gets into their bodies.

A 1962 study published in the Journal of Heredity found that about 70% to 80% of cats respond to catnip, with kittens around 6 to 8 weeks old being the most unaffected. A more recent 2017 study published in BMC Veterinary Research backs up those numbers finding that 68% of domestic cats responded to catnip in some way. Those researchers also found that the intensity of the response had a lot to do with the cats' ages. While older felines tended to have a milder response, younger felines tended to respond more intensely.

On top of that, the method of catnip administration results in different effects. The herb has more of a sedative effect when felines eat it, making them calm and relaxed. When cats smell it, though, the herb works more like a stimulant, so the animals become more hyperactive — meowing and purring, rolling around, and rubbing their bodies on whatever is nearest to them.

As mentioned, catnip (Nepeta cataria) is an herb, and it's part of the mint family with noticeably aromatic leaves. Unlike some hallucinogenic plants native to the United States — like several species of Psilocybes — this plant is native to Africa, Asia, and Europe. It made its way to North America with immigrant settlers, and for centuries, people were using it as an herbal medicinal tea because of its ability to relieve mild digestive discomfort and promote relaxation.

While cats seem to experience the same sedative effects when they ingest catnip, it's the volatile oil nepetalactone in the herb that makes them hyperactive when they smell it. This chemical binds to proteins in the felines' nasal tissues and stimulates their sensory neurons. That triggers a response with the olfactory bulb neurons, sending signals to the amygdala and the hypothalamus. These parts of the brain regulate behavior responses and neuroendocrine responses, respectively.

Basically, nepetalactone mimics their natural sex pheromones and taps into the cats' opioid reward systems. That's why cats can become more affectionate, playful, or even aggressive like a female in heat when they smell catnip, and even males can display these behaviors.