Catnip makes most cats briefly, harmlessly euphoric. Sniffing it triggers rolling, face-rubbing, drooling and zoomies for five to fifteen minutes, then the effect fades on its own. The cause is nepetalactone, a plant oil that activates the brain's reward system. The response is inherited — roughly one in three adult cats barely reacts at all.
That is the short answer to what catnip does to cats. The longer answer — what happens between nose and brain, why sniffing and eating look so different, and why silvervine sometimes works when catnip does not — is one of the better-studied corners of cat science. Let's walk through it.
How does catnip work? The chemistry, step by step
Step 1: the plant releases a volatile
Catnip (Nepeta cataria, a mint-family herb) produces nepetalactone, an iridoid compound that evaporates readily at room temperature. Crushing or rubbing the leaves releases far more of it — which is why cats bite and rake fresh catnip, and why a stale toy stops being interesting.
Step 2: the nose detects it
Inhaled nepetalactone binds to receptors in the cat's olfactory tissue. From there, signals travel to brain regions involved in emotion and reward. Researchers have long debated how much the vomeronasal organ (the "second nose" in the roof of the mouth) contributes; the main olfactory system appears to do the heavy lifting.
Step 3: the reward system lights up
A landmark 2021 study from Iwate University in Japan (Uenoyama et al., Science Advances) showed that exposure to nepetalactol — the closely related compound in silvervine — raises β-endorphin levels in cats' blood, engaging the μ-opioid reward system.
The same research found a striking side benefit: cats that rub their faces in the plant coat their fur in compounds that measurably repel mosquitoes.
In other words, the "catnip crazies" may be evolution's way of getting cats to apply their own insect repellent. Behaviour, chemistry and function, all in one rolling, drooling package.
Catnip effects on cats: reading the behaviours
- Rubbing and face-rolling: the classic response — and, per the Iwate research, the one that transfers those mosquito-repelling iridoids onto fur.
- Rolling on the floor and flipping: general activation of the reward response; play circuits firing.
- Drooling and glazed stillness: also normal. Some cats go loud and acrobatic, others go quiet and blissful.
- Vocalizing and zoomies: excess energy discharging — often followed by a nap.
All of these are self-limiting. After the response fades, cats typically become temporarily unresponsive to catnip for a cooling-off period — which is why we suggest waiting 30 minutes or more before offering it again.
Individual style is also consistent: a roller tends to stay a roller, a quiet driftier stays a driftier. If your cat's response ever changes sharply from their usual pattern, that is worth noting the way you would any behaviour change — not because catnip caused harm, but because pattern shifts are how cats tell us things.
Why sniffing and eating look opposite
Cat parents often notice that sniffed catnip winds cats up, while eaten catnip seems to mellow them out. This difference is widely observed, though less thoroughly studied than the sniffing response — inhaled nepetalactone reaches the olfactory system directly, while chewing and ingesting seems to produce a calmer, slower pattern in many cats.
Both are considered normal, and small amounts of eaten catnip are generally regarded as harmless. If you want the calmer version, toys that let a cat chew — rather than just sniff — are the practical route.
Silvervine: the other, stronger trigger
Silvervine (Actinidia polygama, matatabi) is a Japanese climbing plant whose active compounds — nepetalactol and actinidine among them — hit the same receptor pathways as nepetalactone.
The research numbers are compelling. In a 2017 study of 100 cats (Bol et al., BMC Veterinary Research), around 79% responded to silvervine versus 68% for catnip — and roughly three-quarters of the cats that ignored catnip did respond to silvervine.
That is exactly why our Catnip Lollipop combines both: a natural silvervine stick for chewing plus a catnip component — two different trigger compounds and a chew format, so a cat that shrugs at one has a real chance of loving the other. (Chewing the stick also gives teeth a workout, which is a bonus, not a health claim.)
Why do cats like catnip?
Put the pieces together and the "why" stops being mysterious. Nepetalactone taps a genuine reward pathway — the β-endorphin response — so the feeling is real, not random.
The mosquito-repellency findings supply the evolutionary reason for the machinery to exist: cats that rubbed themselves in these plants picked up chemical insect protection along with the buzz.
So cats like catnip for the same broad reason we like the smell of baking bread: their biology rewards them for seeking it out, and somewhere back down the line, that reward paid survival dividends.
Not just house cats
One of the more delightful findings in this field: the response is not limited to domestic cats. Studies going back decades — and the 2017 Bol work included big-cat observations — report catnip and silvervine responses in lions, jaguars and other wild felids. Tigers, curiously, tend to be indifferent.
That spread across the cat family tree suggests the receptor machinery is ancient, and it fits the mosquito-repellent hypothesis neatly: a self-applied insect defence would be useful to any cat that hunts by lying still in vegetation.
Is it a drug? Is it addictive?
Catnip is not addictive in any meaningful sense. Cats do not develop tolerance that escalates use, show no withdrawal, and walk away on their own when the response ends. The 2021 β-endorphin findings show it engages a natural reward pathway — the same kind engaged by play or food — not that it functions like an addictive substance.
It is also not psychoactive for humans and requires no special handling. Store it airtight, out of reach, mostly so the volatile oils stay potent.
For the fuller safety picture — kittens, amounts, what happens if it is eaten — we cover all of it separately in Is Catnip Safe for Cats? What the Science Actually Says.
Getting the most out of it
- Offer it fresh and crushed — rub dried catnip between your fingers first to release the volatiles.
- Keep sessions occasional. A few times a week keeps the response strong; constant availability dulls interest.
- Pair it with play. Catnip before a play session can kick-start engagement — our guide on how to play with your cat shows the prey-sequence method that pairs well with it.
- Dosage and timing basics are covered in our earlier primer, how to properly use catnip.
FAQ
Why do cats like catnip?
Because it genuinely rewards them: nepetalactone exposure raises β-endorphin levels, engaging the brain's natural reward system (Uenoyama et al., 2021). Researchers believe the behaviour also carried an evolutionary bonus — face-rubbing coats the fur in compounds that repel mosquitoes.
How long does a catnip response last?
Typically five to fifteen minutes, followed by a cooling-off period during which the cat temporarily stops responding. Waiting at least 30 minutes — often longer — before re-offering lets the response reset fully.
Is catnip addictive or harmful?
No. Research shows catnip engages a natural reward pathway (β-endorphin release, Uenoyama et al. 2021), and cats show no escalating use or withdrawal. The response is self-limiting, and cats disengage on their own when it ends.
Why doesn't my cat react to catnip?
The response is genetically inherited, and roughly one in three adult cats lacks it — that is completely normal, not a problem. Kittens under about three to six months rarely respond regardless of genetics. Many non-responders do react to silvervine, which works through related but distinct compounds.
What is the difference between catnip and silvervine?
Catnip's main active compound is nepetalactone; silvervine carries a broader set including nepetalactol and actinidine. In the 2017 Bol study, silvervine had a higher response rate (about 79% vs 68%), including many cats that ignored catnip. Toys that combine both cover the widest range of cats.
Can kittens have catnip?
Catnip is not considered dangerous for kittens, but most simply do not respond before roughly three to six months of age. There is no benefit to offering it earlier — introduce it once your kitten is past that window and see which camp they fall into.
